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What is L-Isoleucine?

L-isoleucine is an essential BCAA (branched chain amino acid). Foods which have high content of L-isoleucine include nuts and seeds, meat, legumes, eggs, peas, soy products, brown rice, and whole wheat, among others. L-isoleucine in the body is generally found in its highest concentrations in the muscles.

L-Isoleucine Benefits

L-isoleucine levels will be lowest right after exercise and will need to be recovered. Supplementation of L-isoleucine one hour before exercise may help aid recovery. L-isoleucine may also help maintain endurance and promote muscle growth when taken in conjunction with exercise.

  • Branched Chain Amino Acid (BCAA)
  • Aids athletic endurance
  • Promotes muscle growth when taken in conjunction with exercise
Supplement Facts
Serving Size: 1000 milligrams
Servings Per Container: -
Amount Per Serving % Daily Value
L-Isoleucine 1000 mg *
* Daily Value not established.
Other Ingredients: None
Free of: Added Sugar, Soy, Dairy, Yeast, Gluten, Additives

Suggested Use: As a dietary supplement, take 1000 mg (about 1/3 tsp) once or twice daily, or as directed by a physician.

Store in a dry, cool place


Isoleucine must be taken in conjunction with the other Branch Chain Amino Acids, valine and leucine. Failure to do this may have an adverse effect on the kidneys and liver. Isoleucine should always be taken with two parts Leucine and one part valine for every one part of isoleucine.

Always consult your health care provider before taking any supplements. Pregnant or lactating women, people with existing medical conditions, or people taking medications should consult their health care provider/s before taking any dietary supplement. If you experience any adverse condition after taking this dietary supplement, discontinue use immediately and consult your health care provider.

Keep out of reach of children.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Customer Reviews
5.0 Based on 10 Reviews
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Samuel M.
United States United States
I recommend this product
I was very pleased with

I was very pleased with this product results.

Great product

I makes Makes this with my protein shake What a great pump. I use all 3 Leucine, valine,l-lsoleucine What a great combination Will buy from Bulk supplement Again good service fast delivery was at my door 4 days after ordering Thank you

As i have tried other products before Bulk suppliments has given me a free of burn amino acid.

I have been Burned in my mouth and body from other supplements claiming to be isoleucine, in conjunction, the products may very well have been a form of isoleucine. Bulk supplements has given me a standard that is far greater in appeal than any other supplement I have tried.

Great product

I use it to make my own BCAA blend with no fillers. very pure and a great price!


I love this product. It really pumps up my energy and focus before my workout. A nice product without all of the extra stuff in pre-workouts. Will continue to purchase this.

Bcaa Mix

I use it in my Bcaa mix and love it. Great I isoleucine very good taste.