L-Leucine Ethyl Ester
Pharmaceutical grade esterized L-Leucine for maximum bioavailability.
Ultra pure with no fillers or additives.  HPLC verified.

* No Longer Avalable *


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NutraBio L-Leucine Ethyl Ester

NutraBio.com Amino Therapy Amino Acids

This product is Kosher, Vegetarian, Hypoallergenic & Pharmaceutical grade. The gelatin capsules are not kosher or vegetarian.   Click to view certification

L-Leucine is an essential amino acid, meaning it can not be made by the body, and must be acquired through food or dietary supplements. Leucine is classified as a "branched-chain amino acid" (BCAA). It comprises about 8% of the total amino acid count in your body's protein structures and is the fourth most concentrated amino acid in skeletal muscle tissue.

L-Leucine stimulates muscle protein synthesis and may be the major fuel involved in anabolic (tissue building) reactions. This makes them especially important for body builders and other athletes in sports that demand explosive strength.

The branch chain amino acids valine, leucine, and isoleucine enhance protein synthesis in liver cells and muscle cells and help promote muscle recovery after exercise. They contribute to energy production in the body by being oxidized in the cell’s mitochondria. Branch chain amino acids are used by body builders and athletes to produce an anabolic effect and assist in the repair of micro tears in muscle tissue that are a normal result of exercise. Leucine is thought to be the most effective BCAA for preventing the body’s burning of muscle stores for energy during intense workouts because it is converted to glucose more quickly than isoleucine and valine.

      • Maintains nitrogen balance.
      • Preserve lean muscle tissue.
      • Supplies the body with energy when under stress.
      • Preserves muscle glycogen (glucose stored in muscle used to power muscular contraction).
      • Enhances thinking abilities that can decline as physical activity becomes more intense.

The benefits of L-Leucine Ethyl Ester:  Amino Acid Esters are amino acids with an ester molecule attached. Esters are organic compounds that are formed by esterification, which is the reaction of carboxylic acid and alcohols. Esters are organic compounds that help shuttle the amino acid across lipid membranes of the gut and directly into the bloodstream for direct transport to your cells. This prevents the amino acid from being destroyed in the gut and drives more of the free form amino acid directly into muscle tissue where it can be more efficiently used for its intended purpose.

Free form amino acids have inherent limitations such as limited absorption through the intestine. Whereas amino acid esters can pass through the intestine largely intact, regular free form aminos can be significantly degraded in the intestine, leaving only trace amounts of the ingested dose active. Because of the rapid breakdown of some amino acids
in the intestine, its beneficial effects can be limited. Ethyl ester amino acids are thought to have a much better absorption rate and a longer half-life in the body than regular free from amino acids because it is slightly more lipophilic.

Amino acid ethyl esters are technically amino acids derivatives. Their ergogenic effects are similar to those of their base free form amino acids, but the presence of an ester will make the ergogenic effects of more pronounced. The presence of the ester not only enhances the function of amino acid and overcomes its inherent limitations, but the presence of an ester and increased absorption also reduce the need for large doses, which may put less stress on the body.


NutraBio.com Amino Therapy Amino Acids

We guarantee our supplements to be the freshest and purest: Our powders and capsules contain only pure active ingredient with absolutely no additives. Other manufacturers, in an effort to keep costs down, dilute their products with cheap fillers and add chemical excipients to their products to speed up their manufacturing output. These practices cheat you out of the active ingredient. At NutraBio, we've perfected our manufacturing technology so that excipients aren't needed, that means no microcrystalline cellulose, magnesium stearate, silica or other fillers, just 100% pure active ingredient. NutraBio supplements are manufactured under the strictest standards producing the highest quality and purest supplements available anywhere. Our raw ingredients undergo state of the art HPLC analysis to insure zero tolerance for impurities.

Grade pharmaceutical
Purity 99.83%+ purity (HPLC)
Taste bitter
Solubility water soluble
Characteristics no cramping or bloating
Appearance white to off white crystalline powder
Odor n/a
pH n/a
Classification (amino acid ester): sports & muscle building, BCAA
CAS Registry 2743-40-0
Synonyms L-leucine ethyl ester HCl, Ethyl L-leucinate hydrochloride
Molecular Formula C8H17NO2•HCl
Molecular structure

NutraBio L-Leucine Ethyl Ester Molecule

Amino acids

NutraBio L-Leucine Ethyl Ester CapsulesSuggested Usage: As a dietary supplement, take 2-3 grams up to twice daily or as directed by your physician. The typically recommended dose for L-Leucine ranges from as little as 500 milligrams per day to as much as 6 grams or more per day, depending upon individual needs.  

Hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy, wheat, sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.

NutraBio L-Leucine Ethyl Ester PowderWarning: NOT INTENDED FOR USE BY PERSONS UNDER THE AGE OF 18. KEEP OUT OF THE REACH OF CHILDREN. If you are pregnant or breast feeding, consult your health care professional before using this product. People with known medical conditions and/or taking drugs should consult with a licensed physician and/or pharmacist prior to taking any dietary supplements. This supplement should be used by healthy adults only.


Quality & Purity since 1996:   Since 1996, NutraBio has manufactured the purest pharmaceutical grade products available. Each batch is laboratory tested to be at least 99.9% pure or we won't ship it to you. We manufacture in the United States to meet FDA 21 CFR Part 111 c-GMP regulations and all ingredients undergo state-of-the-art analysis to insure zero tolerance for impurities. We ship our products direct to you to guaranty the freshness.

  • Manufactured by us in our GMP facility.
  • HPLC laboratory tested for purity.
  • Freshly manufactured - never expired or closeout products.
  • Backed by the NutraBio 30-Day money back guarantee.

No excipients or fillers: Our goal is to manufacture our supplements as pure as possible, so we don't use fillers, binders, or chemical excipients. Other manufacturers, in an effort to keep costs down, dilute their products with cheap fillers and excipients, which cheats you out of the active ingredient and contaminates your product with unneeded chemicals. At NutraBio, we keep our products clean and only use excipients when absolutely necessary. Purity is our #1 goal.

FREE dosing scoop with your powder order: Get the exact dosage every time with a free single-dose scoop. This scoop was designed by our lab to give you exactly one serving each time. No more measuring or guessing.



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