Best Leucine Supplements Ranked for 2018 (Top 10 Brands)

This is our official list of the best selling leucine supplements on the market right now.

These 10 l-leucine brands have been ranked because they dominate the e-commerce sales charts, fitness bloggers love them and they have the highest user reviews online.

Top 10 Leucine Products Compared

Heads up, there are affiliate links in this article, so if you buy something, we get a cut of the sale.


1. BulkSupplements Pure L-Leucine Powder

BulkSupplements Pure L-Leucine Powder

This may be the best leucine powder available on the market. BulkSupplements Pure L-Leucine delivers 2,500 mg of no filler, clean L-Leucine per serving. It’s also very affordable.

Specs

  • 500 grams (17.6 oz) per package
  • 2,500 mg of leucine per serving
  • 200 servings per container
  • Free of Soy, Sugar, Dairy, Gluten, Yeast, and other additives
  • Highly recommended
  • Mixes well
  • Great reviews

Who Makes It?

Hard Eight Nutrition LLC has been doing business as BulkSupplements since 2013. Based out of Henderson, Nevada, BulkSupplements has over 400 nutritional supplements that are sold to consumers and manufacturers alike.

Bottom Line

This is one of the best Leucine supplements on the market today. With a high dose and zero fillers, you are receiving a pure, vetted product when you purchase BulkSupplements Pure L-Leucine powder.

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Where to Buy It
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2. NutraBio 100% Pure L-Leucine Powder

Nutrabio 100 Pure L Leucine Powder

With 3,000 mg of pure L-Leucine per serving, NutraBio 100% Pure L-Leucine powder is perhaps the most powerful leucine supplement available. This powder is naturally fermented from plant sources, so it’s safe for vegans.

Specs

  • 500 grams per container
  • 166 servings for container
  • 3,000 mg L-Leucine per serving
  • Vegan
  • Non-GMO
  • Gluten free
  • No fillers added
  • Made in USA
  • Good reviews

Who Makes It?

NutraBio has been in the supplement business for more than 20 years. They follow strict GMP manufacturing regulations in their US-based factories, and consistently produce high quality, affordable products.

Bottom Line

This is a strong leucine supplement from a trusted brand in the supplement industry. With a high dose and no unnecessary fillers, NutraBio 100% Pure L-Leucine shows why it is considered a top product in the supplement world.

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Where to Buy It
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3. Source Naturals L-Leucine

Source Naturals L-Leucine

This is an effective, cost efficient leucine supplement in capsule form. Source Naturals L-Leucine capsules over 500 mg of leucine per capsule.

Specs

  • 60 capsules per container
  • 500 mg leucine per capsule
  • Good value
  • Made in USA
  • Trusted brand

Who Makes It?

Since its creation in 1982, Source Naturals have introduced many award-winning formulas. Their products are created and manufactured in Scotts Valley, CA. Source Naturals has very high standards for their supplements. From raw material to finished goods they run multiple tests on every ingredient to ensure a quality finished product.

Bottom Line

Source Naturals L-Leucine capsules have high reviews. The 500 mg dose may be less than some other leucine supplements, but these capsules may be a preferable way to ingest as some reviews note the taste in the powder can be undesirable.

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Where to Buy It
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4. NutraBio 100% Pure L-Leucine

NutraBio 100% Pure L-Leucine

This is similar to the NutraBio leucine product reviewed above, but instead of powder it is in capsule form. Each capsule is loaded with 400 mg of leucine. Total daily dose is 2 capsules 1-2 times, so 800 mg a serving.

Specs

  • 240 capsules per container
  • 60 servings per bottle
  • 6 g of L-Leucine per day
  • Vegetable capsules
  • Vegan
  • Non-GMO
  • Gluten free

Who Makes It?

Founded in 1996, NutraBio has been manufacturing high quality supplements for more than 2 decades. They manufacture all their products in the United States at a GMP-certified manufacturing facility to ensure quality and consistency. NutraBio supplements are made following the strictest Good Manufacturing Practices standards.

Bottom Line

One of the best leucine capsules at 800 mg of leucine per dose. If the powder isn’t for you than these leucine capsules are a great alternative.

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Where to Buy It
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5. Serious Nutrition Solutions Leucine

Serious Nutrition Solutions Leucine

This is a cost-effective pure leucine supplement in powder form. It offers 5 grams of L-Leucine per serving.

Specs

  • 5 grams per serving
  • 100 servings per container
  • Cost effective price
  • No fillers

Who Makes It?

Founded in 2005, Serious Nutrition Solutions (SNS) is based out of Virginia. SNS uses top quality ingredients at a cost-effective price.

Bottom Line

SNS Leucine supplement delivers a powerful dose at 5 g per serving, but like most other pure leucine powders there are reviews stating it does not mix well and the taste is undesirable.

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Where to Buy It
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6. Nutricost Pure L-Leucine Powder

Nutricost Pure L-Leucine Powder

Nutricost Pure L-Leucine makes a cost-effective pure leucine supplement in a powder form. This is an effective leucine supplement with 5 grams of L-Leucine per serving.

Specs

  • 5 grams of leucine per serving
  • 100 servings per container
  • Great reviews
  • Third-party tested
  • Non-GMO
  • Gluten free

Who Makes It?

Nutricost is a smaller nutrition company without a significant web presence. It’s a lesser-known company without the reputation of some of our top recommendations.

Bottom Line

This is a strong leucine supplement with a dose of 5 g per serving. The reviews state that it mixes well, and the taste is not too bad.

7. Allmax Nutrition Leucine Powder

ALLMAX NUTRITION Leucine Powder

Allmax Nutrition Leucine makes a 100% pure micronized powder. Each serving offers 5 grams of leucine.

Specs

  • 5 grams of leucine per serving
  • 80 servings per container
  • Third party tested
  • Good reviews

Who Makes It?

Allmax Nutrition has over 15 years in the supplement industry and holds themselves to rigorous quality standards.

Bottom Line

This is a 100% pure micronized leucine powder that is third-party tested and has good reviews.

8. Muscle Feast Instantized L-Leucine

Muscle Feast Instantized L-Leucine

This is an instantized leucine powder that has 2,500 mg of free form L-Leucine per scoop.

Specs

  • 2,500 mg of L-Leucine per serving
  • 80 servings per container
  • Mixes well
  • Great reviews
  • Made in USA

Who Makes It?

Muscle Feast is based out of Nashport, OH. Founded by parents of a bodybuilder because they were not satisfied with other supplements.

Bottom Line

This is a worthwhile leucine supplement that is instantized, so it mixes well.

9. Now Foods L-Leucine Powder

Now Foods L-Leucine Powder

Now Foods L-Leucine powder has 5 grams of L-Leucine per serving. It’s a bit pricey considering the servings per container.

Specs

  • 5 grams of L-Leucine per serving
  • About 51 servings per container
  • Non-GMO
  • Vegan

Who Makes It?

Family owned for over 50 years, NOW Foods is one of the largest health product companies in the world. Headquartered in Illinois, NOW produces more than 1,400 unique products, and has a reputation as one of the industry’s most trusted brands.

Bottom Line

This is a decent leucine supplement from a great company, but it comes at a higher price per serving than some of our top recommendations.

10. Infinite Labs L-Leucine

Infinite Labs L-Leucine

This is a good leucine supplement but has a lower dose at 1 gram of L-Leucine per serving.

Specs

  • 1 gram of L-Leucine per serving
  • 120 servings per container
  • Manufactured in USA

Who Makes It?

Founded in 2006, Infinite Labs is located in Orlando, Florida. They mostly manufacturer athletic and sports nutrition products.

Bottom Line

At 1 gram this is a low dosage compared to some of our top recommendations, but it’s still a good product.

What is Leucine?

Leucine is a branched-chain amino acid (BCAA) that is critical for muscle repair and protein synthesis.

In fact, leucine may be considered the most important of the three BCAAs.

The other two branched-chain amino acids are valine and isoleucine. Leucines’ importance is due to it being the primary amino acid involved in the building of muscle tissue.

As an amino acid, Leucine is one of the “building blocks” of protein and muscle tissue.

As you consume protein your body breaks it down into amino acids. Those amino acids help build muscle and help the body function properly.

It has been noted in studies that leucine helps wounds heal, regulates blood sugar levels, and produces growth hormones (1).

Leucine is one of the nine essential amino acids that the body needs to grow and function properly.

Unlike nonessential amino acids, essential amino acids cannot be created by the body. Therefore, the essential amino acids need to be digested through foods or supplements.

The greatest natural sources of leucine through the diet are animal proteins such as poultry, eggs, and meat.

Leucine can also be ingested through other sources such as beans and legumes.

In supplements you will see “L-Leucine” and “Leucine” as ingredients. These two terms refer to the same active ingredient.

Leucine has many potential benefits, but most studies are centered around its effects on muscle growth and athletic performance.

Leucine Uses

There are many potential uses for leucine supplements, some of which are more proven than others.

Some of these potential benefits include:

  • Strength performance: In one study, researchers had participants supplement with 4 grams of leucine each day during a 12-week resistance training program. This documented study showed that L-leucine supplementation resulted in a significant increase in strength performance (2). Leucine may be used as a nutritional supplement to enhance strength performance – either on its own or combined with other BCAAs.
  • Muscle recovery: A study where participants supplemented before doing squats suggest that leucine may be useful for muscle recovery following exercise. Ultimately, leucine strongly promotes protein synthesis in skeletal muscles (3), and protein synthesis is vital for proper post-workout recovery.
  • Muscle loss: In a two week study the researchers supplemented meals of older adults with 4 grams of leucine per meal, three times a day. Researchers in this study found leucine supplementation may improve muscle protein synthesis in response to lower protein meals in older adults (4). This may be beneficial for slowing muscle loss in older populations, but more research is needed.
  • Muscle gain: It is thought that leucine supplementation may be beneficial for muscle growth, when combined with strength training. Results have shown that low levels of leucine signals mechanistic Target of Rapamycin (mTor) to be disabled. When leucine levels reach sufficient levels, mTor is increased and muscle building can begin (5).

There are more claimed benefits of leucine supplementation, but they may not have adequate clinical evidence supporting them.

As a whole, leucine supplements need more clinical research in order to fully realize its potential benefits.

It’s also worth noting that there are many documented benefits of branched chain amino acids (6), as BCAAs in general are very well-studied.

There have been fewer studies looking specifically at Leucine by itself.

How to Take Leucine

Leucine is known to be bitter tasting as a powder, so you may want to consider capsules if you cannot stomach bitter tastes.

If you want to consume the powder, it can be mixed with protein shakes, smoothies, etc.

There are also flavored powders available, which help to mask the bitter taste of leucine.

There is not an established daily dose for leucine, but most studies above consisted of 4,000 – 5,000 mg per day.

Examine.com notes that leucine is typically supplemented in the 2,000 – 5,000 mg per day range (6).

Depending on your personal goals, manufacturers recommend taking leucine before and after workouts. It may also be beneficial to take before bed to help recovery during sleep.

Side Effects and Precautions

There are no known harmful side effects for taking branched-chain amino acid (BCAA) supplements such as Leucine.

There may be some potential interactions with pharmaceuticals, however.

For instance, leucine supplements combined with diabetic medications can drop blood sugar levels. Therefore, patients with hypoglycemia should not take leucine supplements.

Be sure to ask your doctor or physician before taking supplements. That way, your doctor can check to see if there are any side effects or interactions with medications or foods.

Leucine supplements should not be used by infants, or women who are pregnant or breastfeeding.

What to Look for in a Good Leucine Supplement

Starting your search for the right leucine supplement can be a daunting task.

To find the best leucine supplement, you will want to research products manufactured by companies that are well established in the supplement community.

We have picked some reputable companies for this guide.

Other than company reputation, consider if the supplement is in a capsule or powder form, and decide which of these two will benefit you more.

Each form has their own advantages and disadvantages, so it is up to you to decide which is better for you personally.

It is more beneficial to find leucine that is free from fillers and other ingredients.

Last but not least, consider any certifications that are important to you, such as Non-GMO, Gluten free, etc.

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Austin Meadows

Written by Austin Meadows

Austin Meadows is an independent writer and consultant specializing in health and wellness topics. With more than 7 years of experience writing in the natural health industry, Austin strives to deliver accurate, concise and research based information to his readers. You can connect with him on LinkedIn.