Best Kratom Extracts of 2025: Tried & Tested for Flavor & Effects

If you’ve tried raw kratom leaves or even powders but found them a bit too mild and basic, you'd love to try out kratom extracts. Formulated especially for experienced connoisseurs, kratom extracts contain a potent concentration of alkaloids, offering a range of effects.

After taking a extracts, you might find yourself achieving peak relaxation, a genius-level focus, or even throwing high-fives to strangers because you’re just that stoked.

As for the flavor, some extracts stick to the OG kratom bitterness, while others offer fruity explosions like watermelon, tangy lemon-lime, and even cappuccino. In this article, we’ll share the top kratom extracts of 2025.

Where To Buy Kratom

Best Kratom Extracts: First Look

1. Super Speciosa Liquid Kratom Extract — Best Overall

  • Promotes energy and focus
  • May speed up recovery
  • Free from harmful allergens
  • Full spectrum vegan-friendly formula
  • Lab-tested for purity

This kratom extract packs a punch with its 120mg of mitragynine, blended with purified water, natural flavors, sodium citrate, citric acid, and sucralose. Plus, it’s free from gluten, soy, dairy, and sugar, making it suitable for allergy sufferers and even vegans.

When you need a pick-me-up besides coffee and traditional energy drinks, Super Speciosa Liquid Kratom Extract is the perfect alternative that will improve your energy and focus, so you can easily get through your to-do list. Plus, it brings a lot of motivation, so those daunting tasks feel a lot more doable. If you're feeling the weight of stress, this extract helps melt it away, leaving you super relaxed.

This Kratom extract has a delightful and natural blackberry flavor, which is perfectly balanced with sucralose for a touch of sweetness. This Kratom extract is priced at $13.99, but buying a pack of 12 will cost you $129.99, saving you 23%.

Super Speciosa’s Kratom extract has earned a solid 4.8 rating from satisfied customers. One review that particularly caught our eye mentioned, “I took half a bottle before running and ran 14 miles and didn’t feel any pain or exhaustion - 1 or 2 sips is good and then it’s punch-up time!!! I’d recommend having a plan in place before drinking this ie . a physical, mental or creative activity because if you don’t you’ll just go stir crazy ." Overall, people love the energy it gives but wish it came in multiple flavors.

With high-quality products and responsive customer service, Super Speciosa stands as a top pick for Kratom extracts. While each product is lab-tested for purity, this American Kratom Association-recognized brand also includes a QR code on each product that can be scanned to check all lab reports, strain certifications, and important statistics like mitragynine content, alkaloid profiles, and THC and CBD values. First-time buyers can get 15% off their first order and a 100% money-back guarantee with every purchase.

>>Check the best prices for Super Speciosa Liquid Kratom Extract

2. Kratom Country Red Vein Thai Kratom Extract — Best for Mood Enhancement

  • May improve mood
  • May help with stress release and relaxation
  • Fast-acting formula for quick effects
  • Easy to consume
  • Mild and pleasant taste

This Kratom liquid extract contains 150 ml of unadulterated mitragynine and kratom alkaloids, offering mild and balanced effects.Known for its soothing effects, this kratom extract will give you a euphoric rush that will instantly improve your mood. This extract will potentially alleviate pain and ease depression.

Red Vein Thai Kratom Extract Shot has a herbaceous taste with subtle earthy undertones, making it a real treat for those who love rich yet smooth natural flavors.

With Kratom Country, the more you buy, the more you save. For instance, you can purchase a single ampoule for $14.95, 3 amps for $39.90, 5 amps for $59.90, 10 amps for $119.90, and 15 amps for $180.90.

This Kratom Extract Shot is a real crowd-pleaser. One happy customer shared, " I am very happy with the Red Vein Thai Kratom Extract Shot! Absolutely recommend their products and I will be a long-time customer! " People generally appreciate the pure taste without any powdery aftertaste, saying it blends well in drinks like Mountain Dew or tea.

Kratom Country is a top-rated brand that has been supplying a plethora of Kratom retailers with organic and well-tolerated products that enhance productivity, improve mood, or get quality rest. The brand follows a stringent 5-step lab-testing process to ensure the utmost quality and safety. When in doubt, take the handy beginner’s quiz to narrow down your options.

>>Check the best prices for Kratom Country Red Vein Thai Kratom Extract Shot

3. CryoKratom Gold Kratom Extract Shot — Best for Pain Relief

Pros:

  • May reduce muscle pain and joint soreness
  • Promotes jitter-free mental relaxation
  • May help calm nerves
  • Rigorous lab testing for quality control
  • Quick onset of effects

Con:

  • Some complaints about nausea

This all-natural kratom extract product goes above and beyond, offering 2.5 times the mitragynine potency compared to other brands.

Unlike other kratom products that focus on a single benefit, CryoKratom Gold Kratom Extract Shot is quite versatile. Got muscle and joint soreness after a workout? Check. Feeling anxious before a big presentation or exam? Drink it for mental clarity without the jitters.

Nervous about flying? Adding it to your juice keeps you chill until touchdown. Heading out with friends but want to skip the alcohol? This non-alcoholic extract will keep you relaxed and sociable all night.

This kratom ampoule has a balanced mix of earthy and slightly sweet, making it an easy and pleasant extract to take without the overpowering bitterness.

CryoKratom Gold Kratom Extract Shot can be purchased for just $15. Currently, the brand offers the option to split the payments into four via Sezzle.

CryoKratom Gold Kratom Extract Shot is a standout choice with 83 glowing reviews. Users love its convenience and effectiveness. One reviewer mentioned, “ At last, something that really works every time. I was delighted to enjoy hours of uplifting comfort and joy. This is definitely worth the money. "

CryoKratom has a limited variety of products, but both of them — Gold Kratom Extract Shot and Capsules — deliver effects that go beyond the ordinary. When shopping, don’t forget to sign up for their newsletter to learn all about new products, offers and kratom recipes.

>>Check the best prices for CryoKratom Gold Kratom Extract Shot

4. Kingdom Kratom 175MG Xtreme Kratom Extract — Best Flavor Variety

  • Might enhance your mood
  • Full-spectrum kratom extract
  • High potency and effective formula
  • Convenient for on-the-go usage
  • Available in two delicious and refreshing flavors

Packed with 175 mg of full-spectrum kratom extract, this extract is equivalent to about 12-14 grams of regular kratom powder — saving you the hassle of measuring out powders or dealing with chunky liquids.

Kingdom Kratom's 175MG Xtreme Kratom Extract is your go-to for a serious mood boost. This makes it ideal for social gatherings, stressful workdays, or those annoying Monday blues.

Kingdom Kratom’s 175MG Xtreme comes in two delightful flavors, offering a refreshing twist on traditional kratom. The peppermint mocha offers a cool and minty burst wrapped in a chocolatey undertone, while the pina colada takes you on a tropical ride with its creamy coconut and pineapple blend.

Clocking in at $18.99, this easy-to-use Kratom extract is not only potent but also quite budget-friendly.

After reading 453 reviews, we learned that Kingdom Kratom 175MG Xtreme Kratom Extract is frequently appreciated for its pleasant taste and exceptional quality.

Founded in 2017, Kingdom Kratom quickly established itself as a prominent provider of organic kratom products in the US. The brand educates its customers with a comprehensive Guidebook, offers a convenient VIP program for rewards, and provides same-day shipping with a 100% satisfaction guarantee.

>>Check the best prices for Kingdom Kratom 175MG Xtreme Kratom Extract

5. Happy Go Leafy Liquid Kratom Extract Shot – 150 mg — Best for Beginners

  • 100% all-natural ingredients
  • Tasty and smooth flavor
  • Perfect for a quick energy boost
  • May enhance overall mood
  • No psychoactive drug effects

Formulated with 100% organic kratom leaves, this liquid kratom extract boasts 150 mg of mitragynine per bottle and other additives such as water, sodium benzoate, citric acid, and sucralose, making it smooth and palatable.

Happy Go Leafy Liquid Kratom Extract Shot are perfect for those days when your energy levels are frustratingly low. It may improve your energy levels, so you can power through a challenging workout, finish a big project, or scrub that greasy stove without feeling sluggish.

Happy Go Leafy Kratom offers a smooth grape flavor that goes down easy, making your experience both tasty and enjoyable.

The Kratom extract is available for $25. However, if you're up for their 6-pack bundle, it drops the price to $20 per bottle. Even better, a 12-pack brings the cost down to $16.58 each!

Customers find the Happy Go Leafy phenomenal, despite kratom's usual taste quirks. One user shared that they took a larger dose that directly sent them into chill mode. They later adjusted the dosage for more balanced effects. They only wish it could be a little tastier.

Happy Go Leafy offers various strains of Kratom in capsules, powders, and gummy edibles form. Despite being a smaller enterprise, its swift delivery, premium GMP-certified products, and competitive prices have made it a popular choice among users.

>>Check the best prices for Happy Go Leafy Liquid Kratom - 150 mg

6. Kats Botanical Intense MIt Kratom — Most Potent Formula

  • Strong but relaxing formula
  • Triple-purification process certified
  • Won’t cause any peppy side effects
  • GMP compliant for safety
  • Can be mixed with different beverages

Unlike other raw leaf kratom powders and strain-specific capsules, Kats Botanical Intense MIt Kratom shot contains a hefty 200mg of mitragyna speciosa extract with a simple mix of vegetable glycerin, filtered water, and citric acid.

Whether you're winding down from a tough day or prepping for a low-key evening, this standardized kratom extract keeps you calm and collected. It's great for helping with stress, muscle tension, or just kicking back without those peppy side effects you get from other supplements.

Kats Botanical Intense MIt Kratom has an intense flavor with a noticeable bitter edge, but you can easily mix it with different beverages to mask the taste. Just avoid fizzy drinks and soda as they may not blend well with kratom and affect its effectiveness.

Regarding price, you're looking at $24.99 for a single unit.  Kats Botanical Intense MIt Kratom has received mixed reviews. While some users loved the relaxing effects, others were very pleased with the quick delivery.

Kats Botanical is an excellent Kratom brand for experts and veterans who want something potent enough to provide long-lasting effects. From its Capsules to powders, each product undergoes stringent third-party lab testing for quality assurance. While you won’t find any deals or discounts, you can take advantage of a 30-day money-back guarantee and 20% off.

>>Check the best prices for Kats Botanical Intense MIt Kratom

How Does Kratom Work?

Kratom works by interacting with the body’s opioid receptors, which are part of the central nervous system. The active kratom compounds, known as mitragynine and 7-hydroxymitragynine, bind to these receptors and influence how you feel pain, energy, and mood.

At lower doses, kratom tends to have a stimulating effect, making you feel more alert, focused, and energetic. However, at higher doses, it acts more like a sedative, promoting relaxation and easing discomfort. Because of this versatility, kratom is often used to address various needs, from boosting productivity during the day to helping you wind down at night.

When used responsibly, kratom can support a sense of balance and well-being. However, it’s important to understand the right dosage for your body and stay mindful of how it affects you.

What Are Kratom Extracts?

Kratom extracts are highly concentrated forms of kratom that pack a powerful punch. Instead of taking kratom leaves or powder, extracts are crafted to deliver a more potent experience. These products contain higher levels of alkaloids—mitragynine and 7-hydroxymitragynine—making them far stronger than standard kratom products.

The purpose of liquid kratom extracts is to offer a more convenient and efficient way to enjoy kratom’s benefits. Since they’re concentrated, you only need a small amount to feel the effects. This makes them ideal for those seeking a stronger or faster-acting solution.

>>Check the best prices for Super Speciosa Liquid Kratom Extract

How Are Kratom Extracts Made?

The process of making liquid kratom extracts is both simple and meticulous. It starts with harvesting fresh kratom leaves, which are then dried and crushed into powder. From there, the magic happens:

  • Boiling or Brewing : The kratom powder is boiled in water to extract its alkaloids, the compounds responsible for its effects.
  • Filtration : The liquid is carefully filtered to remove any plant material, leaving only the potent alkaloid-rich solution.
  • Concentration : The liquid is further reduced by evaporation, increasing the concentration of alkaloids. Some extracts are enhanced with additional alkaloid isolates to amplify their potency.
  • Final Form : Depending on the product, the extract may be left as a thick resin, turned into a tincture, or powdered and encapsulated for easy use.

How Are Kratom Extracts Different from Other Kratom Products?

Kratom extracts stand apart from traditional kratom products like powders or capsules due to their concentration and potency. While regular kratom contains alkaloids in their natural levels, extracts condense those compounds into a more powerful form.

Extracts are significantly stronger, meaning you can use smaller amounts to achieve the same effects as larger doses of powder. With extracts, you don’t need to measure or consume large quantities. A small dose goes a long way, making it easier and quicker to use.

Because extracts are more concentrated, their effects are often felt more quickly than with traditional kratom products. Extracts come in multiple forms, including liquids, capsules, and resins, giving you more options to suit your preferences.

How We Choose the Best Kratom Extracts

Finding the best kratom extracts isn’t just about picking any product off the shelf—it’s about ensuring you’re getting safe, effective, and high-quality options that deliver results. Here’s what we look for when evaluating the best kratom extracts:

Potency and Strain

Not all extracts are created equal. The strain and potency of an extract play a big role in its effects. We focus on extracts made from well-known, powerful strains like Maeng Da and Thai Kratom.

These strains are famous for their strong, consistent effects, whether you’re looking for energy, relaxation, or pain relief.

Brand Reputation

Trust is everything. We prioritize brands with a solid reputation for delivering top-quality kratom. Companies that have been around for years and are well-loved by their customers always stand out.

Lab Testing and Transparency

Safety is non-negotiable. The best brands back up their claims with independent lab testing, showing that their extracts are free from contaminants like heavy metals or harmful chemicals. Clear lab reports and detailed product labels give you peace of mind about what you’re using.

Transparency and Information

Good brands don’t keep secrets. They share everything from how the extracts are made to the alkaloid percentages and suggested dosages. The more transparent a brand is, the easier it is for you to make an informed choice.

Customer Feedback

Your voice matters. Real customer reviews help us understand what works and what doesn’t. We look at what people say about potency, flavor, ease of use, and how the product fits into their lifestyle. Patterns of positive feedback are a strong indicator of quality.

Pricing

Quality liquid kratom extracts shouldn’t break the bank. While we don’t chase the cheapest options, we ensure the products provide great value for the price. Deals, bundles, and discounts are always a plus.

Extraction Methods

How a standardized extract is made can make or break its quality. We prefer brands that use clean extraction methods like water-based or ethanol extraction. These processes preserve the natural alkaloids without leaving behind harmful residues.

Ethical Sourcing

Kratom isn’t just a product; they’re kratom plants with a cultural history. Ethical sourcing ensures that farmers are paid fairly and the environment is respected. We look for kratom brands [a] that work directly with sustainable farms in Southeast Asia, where kratom grows naturally.

>>Check the best prices for Super Speciosa Liquid Kratom Extract

Best Kratom Strains for Kratom Extracts

Every kratom strain has its own personality, and choosing the right one depends on what you’re looking for. Some strains are better for relaxation, while others give you energy and focus. Here are the top strains we recommend for liquid kratom extracts:

Maeng Da Kratom

Maeng Da is the powerhouse of kratom strains. Known for its high potency, it’s perfect for those seeking a big energy boost or strong relief from discomfort. Concentrated extracts made from Maeng Da deliver fast, noticeable results that both beginners and experienced users love.

Thai Kratom

If you’re looking for something to brighten your day, Thai Kratom is the way to go. It’s uplifting and energizing, making it ideal for improving focus, productivity, and overall mood. Concentrated extracts from this strain are a favorite for daytime use.

Bali Kratom

Bali Kratom is the all-arounder. It’s relaxing but also slightly energizing, giving you the best of both worlds. Concentrated extracts from Bali Kratom are great for easing stress, reducing pain, and helping you unwind without making you feel too drowsy.

Borneo Kratom

When it’s time to relax, Borneo Kratom has your back. Known for its calming effects and pain-relieving properties, extracts from this strain are perfect for evening use or when you need some serious relaxation.

Sumatra Kratom

For those who need something that lasts, Sumatra Kratom is a great choice. Its effects are long-lasting, making it ideal for sustained focus, energy, or relaxation throughout the day. Extracts from this strain are a go-to for people who don’t want to re-dose frequently.

Trainwreck Kratom

Can’t decide on just one? Trainwreck Kratom is a unique blend of multiple strains, giving you a combination of effects. Extracts from Trainwreck are perfect if you want an all-in-one solution for energy, mood enhancement, and relaxation.

Potential Health Benefits of Kratom Extracts

Kratom extracts are known for their concentrated effects, making them a popular choice for those seeking natural support for various aspects of their well-being. Here are some of the potential health benefits:

Energy and Focus

Kratom extracts, especially from strains like Maeng Da and Thai Kratom, are widely used to boost energy and enhance focus [1].

At lower doses, the active kratom alkaloid stimulate the central nervous system, promoting alertness, mental clarity, and sustained productivity.

This makes kratom extracts a favorite among students, professionals, and anyone looking to power through a busy day.

Anxiety Reduction

For those struggling with anxiety, kratom extracts can provide a calming effect [2] . Strains like Bali and Borneo are known for their soothing properties, helping to ease tension and promote relaxation without causing sedation at moderate doses. These extracts can help you feel more grounded and better equipped to handle stress.

Pain Relief

One of the most common reasons people turn to kratom extracts is for natural pain relief. The concentrated kratom alkaloid, particularly 7-hydroxymitragynine, interacts with receptors in the body, helping to reduce discomfort from conditions like chronic pain, arthritis, or injuries [3]. Strains such as Borneo and Bali are particularly effective for managing pain.

Sleep Improvement

If you’re having trouble sleeping, kratom extracts can help you wind down. Indica-leaning strains like Bali and Borneo, when taken in higher doses, can promote relaxation and help you achieve deeper, more restorative sleep. These extracts are ideal for those dealing with insomnia or irregular sleep patterns.

Mood Improvement

Kratom extracts are often used to enhance mood and provide a sense of well-being. Strains like Thai and Trainwreck are particularly uplifting, offering a natural boost that can help combat feelings of sadness or fatigue. By interacting with dopamine and serotonin pathways, kratom extracts may promote a positive outlook and emotional balance.

How to Use Kratom Extracts

Kratom extracts are a potent and convenient way to enjoy the benefits of kratom. To get the best experience, it’s essential to use them correctly. Here’s what you need to know:

Recommended Dosage

The right dosage of kratom extracts depends on your experience level, body weight, and the strength of the product. Since extracts are more concentrated than standard kratom powder, a smaller amount is usually sufficient.

  • Beginner Users : Start with 1-2 grams of extract to assess your tolerance and effects.
  • Moderate Users : 2-4 grams is typically enough to feel noticeable effects.
  • Experienced Users : For stronger effects, 4-6 grams may be used, but proceed with caution to avoid overconsumption.

How Long Does It Take for Kratom Extracts to Work?

Kratom extracts work faster than traditional kratom products because of their concentrated kratom alkaloid content. Here’s a general timeline for what you can expect:

  • Onset : Effects usually begin within 15-30 minutes after consumption.
  • Peak Effects: The full intensity is typically felt between 30-60 minutes after use.
  • Duration : Depending on the dosage and your metabolism, the effects can last anywhere from 4-8 hours.

Pro Tip: Always measure your dosage carefully, especially with liquid extracts or tinctures. Overuse can lead to unwanted side effects. By starting small and adjusting gradually, you can enjoy kratom extracts safely and effectively.

>>Check the best prices for Super Speciosa Liquid Kratom Extract

Different Types of Kratom Extract Products

Kratom extracts come in various forms, offering options to suit every preference and lifestyle. Each product type has its unique advantages, so you can choose the one that fits your needs best.

Kratom Teas

Kratom teas are a traditional and enjoyable way to consume kratom extracts. These teas are brewed by mixing kratom extract powder or leaves into hot water, sometimes with added flavorings like lemon or honey to mask the bitter taste.

Kratom Tinctures

Kratom tinctures are liquid extracts made by soaking kratom leaves in a solvent, such as ethanol or water, to concentrate the alkaloids. They come in small bottles with droppers for precise dosing.

Kratom Liquids

Kratom liquids are similar to tinctures but are often pre-measured and ready to use. They’re convenient for on-the-go use and typically come in single-serving bottles.

Kratom Gummies

Kratom gummies are a newer, user-friendly option for those who want to avoid the bitterness of kratom. These chewable treats are infused with kratom extract and often come in tasty flavors.

Kratom Powders

Kratom powders are the most versatile option, as they can be mixed into drinks, added to food, or encapsulated for easy consumption. Extract powders are more concentrated than regular kratom powders, making them highly potent.

Potential Side Effects of Kratom Extracts

While kratom extracts offer several potential benefits, they can also cause side effects, especially if not used responsibly or in excessive amounts. It’s essential to be aware of these risks to use kratom safely.

  • Nausea and Vomiting: High doses or first-time use can cause stomach discomfort.
  • Dizziness: Overconsumption may lead to lightheadedness or a spinning sensation.
  • Dry Mouth: A temporary but common side effect of kratom use.
  • Constipation: Regular use may slow digestion, leading to bowel issues.

Tips and Safety Precautions

If you’re new to kratom extracts, begin with the smallest possible dose (1-2 grams or less) to assess how your body reacts. Gradually increase only if needed. Kratom can lead to dehydration, so drink plenty of water throughout the day to avoid dry mouth, headaches, and fatigue.

Never mix kratom extracts with alcohol, medications, or other substances that depress the central nervous system. Combining substances increases the risk of side effects or adverse reactions. To avoid dependency, use kratom extracts sparingly. Stick to 2-3 times a week at most, giving your body time to reset between uses.

Keep kratom extracts in a cool, dark place away from children and pets. Proper storage maintains potency and safety. If you’re using kratom for a specific health concern or taking other medications, consult a healthcare provider to avoid interactions or complications.

FAQs

How Does a Kratom Extract Make You Feel?

Kratom extracts provide a more concentrated and intense experience compared to traditional kratom products. Depending on the strain and dosage, you may feel energized, focused, relaxed, or euphoric. Lower doses tend to be stimulating, while higher doses lean toward relaxation and sedation.

How Many Grams of Kratom Are in Extract Products?

The amount of kratom in an extract depends on its concentration. Extracts are typically labeled with ratios like 10x or 20x, indicating how much raw kratom was used to produce the extract. For example, 10x extract means 10 grams of kratom leaves were concentrated into 1 gram of extract. Always check the product label for specific details.

Which is the Strongest Kratom Extract?

Among the most potent products is MIT45 Super K [b] , a liquid kratom extract that stands out for its high concentration of mitragynine and 7-hydroxymitragynine. Known for its fast-acting and powerful effects, MIT45 Super K is ideal for experienced users seeking strong relief or energy boosts.

Where Can I Buy the Best Kratom Extract?

You can buy the best kratom extracts at reputable vendors like Super Speciosa , offering a wide variety of kratom products, including powders, capsules, and extracts. Super Speciosa is committed to safety and quality, with all products undergoing rigorous third-party testing.

What Does a Kratom Extract Taste Like?

Kratom extracts typically have a strong, bitter flavor, especially in liquid or kratom powder form. Some products, like gummies or flavored tinctures, are designed to mask the bitterness and make the experience more enjoyable. If you prefer to avoid the taste, capsules are a great option.

How Long to Wait Between Kratom Extract Doses?

To avoid tolerance, dependency, or side effects, it’s recommended to wait at least 24-48 hours between kratom extract doses. This allows your body to process the alkaloids fully and reduces the risk of overuse. If you’re new to extracts, giving yourself longer breaks between doses is even better.

Final Verdict

Kratom extracts have become increasingly popular due to their potency, quick effects, and convenience, making them a go-to option for many kratom enthusiasts compared to traditional forms.

The Super Speciosa Liquid Kratom Extract stands out for delivering deeply soothing and calming effects, but other products on the market are equally impressive, offering remarkable potency and unique benefits.

To ensure a safe and effective experience, always adhere to the recommended dosage guidelines. Start with a low dose, gradually increasing if necessary. Have a good one!

References:

  1. Prozialeck WC, Jivan JK, Andurkar SV. Pharmacology of kratom: an emerging botanical agent with stimulant, analgesic and opioid-like effects. J Am Osteopath Assoc. 2012 Dec;112(12):792-9. PMID: 23212430.
  2. Müller E, Hillemacher T, Müller CP. Kratom use for depression/anxiety self-management: challenges during the COVID-19 pandemic - A case report. Heliyon. 2021 May 10;7(5):e07039. doi: 10.1016/j.heliyon.2021.e07039. PMID: 34136676; PMCID: PMC8180622.
  3. Vicknasingam B, Chooi WT, Rahim AA, Ramachandram D, Singh D, Ramanathan S, Yusof NSM, Zainal H, Murugaiyah V, Gueorguieva R, Mansor SM, Chawarski MC. Kratom and Pain Tolerance: A Randomized, Placebo-Controlled, Double-Blind Study. Yale J Biol Med. 2020 Jun 29;93(2):229-238. PMID: 32607084; PMCID: PMC7309661.

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