2021's 10 Best L-Leucine
TOP SUPPLEMENTS

Best L-Leucine

While there are 21 amino acids in the human body, only three – leucine, iso-leucine, and valine – have been identified as “branched-chain amino acids” or BCAAs due to their usefulness in exercise, sports, and overall fitness.

L-leucine has become especially popular in the muscle building and bodybuilding community due to studies showing its usefulness in promoting protein synthesis, a key component of muscle growth. There are a number of high protein food sources that provide leucine, but the supplement L-leucine has been shown to be far superior in bioavailability to promote the following L-leucine benefits:

L-Leucine Benefits

Fatigue

One study demonstrated that leucine is one of the most utilized amino acids in the body, especially during physical activities. (See Reference 1)

As amino acids such as leucine are utilized and broken down to fuel muscle performance, amino acid levels in the blood eventually decrease while another amino acid called tryptophan increases. This is important because tryptophan is converted into serotonin, which has been shown to promote tiredness or fatigue during and after physical activity. The result is many gym goers have the “hit the wall” feeling around mid-workout. (See Reference 2)

Studies show that supplementing with L-leucine before and during your workout may reduce the feeling of fatigue while increasing mental alertness.

Muscle Catabolism (Breakdown)

Muscle breakdown is normal to an extent. Protein needs to be broken down in order to be built back up bigger and stronger. (See Reference 3) This is the foundation of muscle growth. But when protein breakdown exceeds protein synthesis, muscle loss occurs. Ways in which you can fuel excessive protein breakdown include extended fasting, over-training, and restricted-calorie diets. (See Reference 3)

Studies show that supplementing with L-leucine can halt or significantly reduce protein breakdown from occurring while promoting protein synthesis (more on that below). L-leucine has been found to be especially useful for those suffering from muscle wasting conditions.

Muscle Growth

Continuing with the point above, L-leucine has been shown in several studies to boost protein synthesis, which is when the body produces muscle protein, a key for growth. (See Reference 4)

By stopping protein catabolism (breakdown) and increasing protein synthesis (creation), (See Reference 6) L-leucine can help to maintain the muscle mass you currently have while helping you build bigger lean muscle tissue. (See Reference 5)

One study found that subjects who drank an L-leucine supplement following a workout developed up to 22% more muscle mass than their placebo counterparts.

DOMS (Muscle Soreness)

Once your workout has wrapped up, L-leucine can still be of some benefit to you. Yes, it will protect your muscle tissue from excessive breakdown, but it may also alleviate delayed-onset muscle soreness, better known as DOMS or the soreness you feel after a tough workout. (See Reference 7)

Studies show that because L-leucine mitigates protein catabolism (breakdown) during and after your workouts, it prevents levels of creatine kinase from getting too high. Elevated levels of creatine kinase are a tell-tale sign of muscle damage and protein breakdown.

As a result, L-leucine may help to alleviate muscle soreness while promoting recovery. In one study, subjects reported less muscle fatigue and muscle soreness post-workout than those who were given a placebo supplement.


2021's 10 Best L-Leucine
TOP SUPPLEMENTS

Our list of the top 10 L-leucine supplements is organized to reflect what you most value in your supplements. First and foremost is quality. All ten of these top ten supplements meet high standards of quality and come from brands with a proven record in excellence and purity. Another important factor in deciding the top ten was cost. You don’t have to pay through the nose to get a high quality supplement. In addition, all the companies represented on our top ten list have stellar records with customer service and prompt shipping to ensure that your supplement experience is enjoyable from the first click to your final dose.

Nutricost Leucine Powder is our #1 Rated Leucine Supplement, as it is high quality and half the price of its competitors. Nutricost Leucine Powder features 5000 mg of Leucine in each serving. Click Here for Lowest Price

Uniquely, Nutricost is one of the few companies that control the full chain of manufacturing, from sourcing to manufacturing in an FDA-registered facility to warehousing and fulfillment, ensuring strict quality standards are met. Nutricost also offers exceptional customer support for all of its products.

Priced under $20, Nutricost Leucine Powder comes with 100 servings, which is just $0.19 each!. With Nutricost, you can be assured that this product does NOT contain ANY extra ingredients, fillers, or preservatives.

Nutricost Leucine Powder comes with a 120-day, no-questions-asked, money-back guarantee – the best guarantee on the market!

  • Our #1 Leucine!
  • Amazon's Choice
  • Only $0.19 per Serving!
  • Potent 5000 mg Per Serving
  • Non-GMO, Gluten Free, 3rd Party Tested
  • Made in a GMP Compliant, FDA Registered Facility
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • Lab Grade
  • 3 Grams Per Serving
  • Gluten Free
  • Lab Grade
  • 3 Grams Per Serving
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • Clean & Pure Powder.
  • No Fillers.
  • Factory Sealed Foil Zip Pouch.
  • Lab Tested for Verification
  • Guaranteed Purity.
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • Supports Protein Synthesis
  • Enhances Performance and Recovery
  • Supports Recovery and Lean Muscle
  • Gluten Free
  • Vegan
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • Manufactured with no stearates, fillers, or flow agents
  • Vegan
  • Non-GMO
  • Gluten Free
  • 100% Laboratory Tested
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • ESSENTIAL AMINO ACID
  • MUSCLE PROTEIN SYNTHESIS
  • MUSCLE RECOVERY
  • RETAIN MUSCLE
  • NATURALLY FERMENTED
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • Science - Innovation - Quality - Results
  • 100% Pure Micronized Powder
  • Micronized 100% Pure Powder
  • Stimulates Protein Synthesis
  • Preserves Lean Muscle Mass
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • Essential in Muscle Building
  • 50 DAY SUPPLY
  • 100% PURE
  • GUARANTEE MONEY BACK
  • MADE IN OREGON
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • HPLC Certified Purity
  • 200 grams L-Leucine
  • Leucine Powder
  • Instantized, so it mixes very well in water
  • Unflavored
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.

  • PURE ORGANIC INGREDIENTS
  • 50 DAY SUPPLY
  • 100% PURE
  • GUARANTEE MONEY BACK
  • MADE IN USA
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*Individual Results May Vary - Ratings are based on Society Health Ranking System and do not necessarily reflect typical results from the use of these products. We encourage consumers to research by visiting each product's website for more information.