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L Isoleucine

L Isoleucine is an essential amino acid that cannot be produced by the body and is therefore required through food or supplementation.

L Isoleucine is popular with trainers due to its ability to increase energy levels and endurance during heavy training sessions. L Isoleucine is also important for protein synthesis, thereby supporting muscle growth and recovery following intense training.

Data based on vanilla flavour ND Contour ND Hydroxyshred GARCINIA CAMBOGIA ACETYL L CARNITINE WHEATGRASS POWDER
Protein per serve (g) 18 25.9 0 0 0
Take For
Ingredients Whey & Casein Whey & Casein 100% garcinia cambogia 100% Acetyl Carnitine 100% Wheat grass
Carbs per serve (g) 2.1 3.1 0 0 0.5
Fat total per serve (g) 0.4 1.0 0 0 0.2
Sugars per serve (g) 1.7 2.6 0 0 0.2
Serving Size (g) 25 40   1 30
Serves per kilo 40 25 83 250 33
Additional Premium Ingredients Fat burners, fibre, colostrum Thermogenic whey protein blend to help build lean muscle and burn fat Hydroxy Citric Acid (HCA) is an ingredient found in the fruit rind of Garcinia cambogia 100% pharmaceutical grade Acetyl Carnitine 100% Wheat grass
Notes Female blend to build muscle and burn fat Fat burners, vitamins & minerals, colostrum Assists with appetite suppression and weight loss Releases stored body fats into the bloodstream Contains Chlorophy to help remove toxins
Flavours Chocolate, Vanilla, Coffee, Strawberry Choc, Vanilla Natural Natural  


  • Important for energy and endurance
  • Assists in improving recovery times
  • Supports lean muscle growth

Uncover the Benefits of L-Isoleucine for your Fitness Program

There are numerous supplements in our Australian online supplements range, so it is easy to miss a powerful supplement that could provide you with numerous benefits during your fitness routine. One of these Australian online supplements are the branched chain amino acids, which are often found in protein powder, but also in individual amino acid supplements that can be used for specific fitness goals. L-Isoleucine is one of those amino acids. To learn more about L-Isoleucine from our range of Australian online supplements, please read our information below.

What Is L-Isoleucine and What Does It Do in the Body?

L-Isoleucine is quite important for athletes, which is why this supplement is popular in our range of Australian online supplements. L-Isoleucine is classified as an essential amino acid; this means that the body cannot make this amino acid, so athletes must obtain it from food or from one of our Australian online supplements.

Even though athletes may need to use a protein powder to get this branched chain amino acid, getting L-Isoleucine is an excellent investment when you consider its functions. L-Isoleucine is known to increase your endurance during training sessions, but also assists in the repair and rebuild of muscle tissue.

What Are Essential and Branched Chain Amino Acids?

Essential and branched chain amino acids are commonly found in protein powder and considered as vital substances for athletes who aim to increase their muscle mass, as well as athletes who want to lose fat. In general, there are eight essential amino acids. In addition to L-Isoleucine, the essential amino acids also include L-Leucine, L-Lysine, L-Methionine, L-Phenylalanine, L-Threonine, L-Tryptophan and L-Valine.

L-Isoleucine is not only an essential amino acid; it is also a branched chain amino acid; this together with two other amino acids called L-Valine and L-Leucine. The combination of these three amino acids is often used in high-quality protein powders, since they are known to promote muscle recovery after intense training sessions.

Isoleucine can also be an important source of energy, which is another reason why this branched chain amino acid is commonly found in protein powder. Isoleucine can be broken down into smaller parts, which are then used within the muscle tissue as a source of energy. Subsequently, isoleucine can prevent the body from starting to break down muscle tissue for additional energy when needed.

How Does L-Isoleucine Work in the Human Body?

L-Isoleucine functions quite like Valine, another branched chain amino acid commonly found in protein supplements. Both L-Isoleucine and Valine can be precursors for other substances; this includes glutamine and alanine. Glutamine and alanine are important substances for athletes doing weight training, since these substances fuel muscle cells and prevent the use of other important amino acids.

Due to its unique functions, L-Isoleucine plays a major role in biological processes such as protein synthesis, anabolism and catabolism. Therefore, when athletes do not have the right amount of amino acids in their system, it could hinder their muscle growth or prevent progress towards their intended fitness goal.

Is Amino Acid Ratio Important?

When you have been considering supplementing with an amino acid supplement, you may have come across amino acid ratio. Fact of the matter is, athletes do need to take a specific ratio of amino acids to get benefit from their supplement. However, the optimal ratio for amino acid supplements is still widely discussed by scientists and medical researchers all over the world.

Many experts always advise taking isoleucine with the other two remaining branched chain amino acids; leucine and valine. For that combination to be successful, some scientists believe athletes should consume half the amount of isoleucine compared to L-Leucine and L-Valine. However, either scientists and medical researchers claim that a ratio of 4:1:1 or 3:1:1 is more beneficial.

Even though there is some confusion regarding the optimal ratio of branched chain amino acid supplements, experts do agree that supplementing with branched chain amino acid supplements in any ratio can have benefits.

When Should L-Isoleucine Be Used?

L-Isoleucine is an essential amino acid; this means that everyone needs it to be healthy. However, L-Isoleucine could be especially beneficial for athletes who exercise a lot, but do not get enough regular protein in their diet.

Supplementing with L-Isoleucine will give athletes benefits for their muscle protein synthesis and decreased muscle catabolism. It can also promote anabolism, which means your muscle will grow better. Of course, these benefits can only be enjoyed if the athlete has a good exercise routine and lives a healthy lifestyle.

How Do I Know If I’m Short Of L-Isoleucine?

Minor deficiencies of L-Isoleucine usually go by unnoticed, although athletes could experience a lack of progress despite a good training routine. However, a major lack of L-Isoleucine can have some serious side-effects.

A shortage of L-Isoleucine in your system is often associated with symptoms that are quite like hypoglycaemia; this includes symptoms such as dizziness, fatigue, headaches, confusion, irritability and depression. However, we do need to mention that people consuming a balanced and nutritious diet are unlikely to develop a deficiency of this amino acid.

What Other Sources of L-Isoleucine Are There?

In addition to supplements and protein powders, athletes can get L-Isoleucine from many foods. Solid foods that are known to be rich in L-Isoleucine include meat, fish, eggs, nuts and seeds. However, athletes who are subjected to rigorous training on a regular basis are more likely to develop a shortage and could need a supplement.

When you intend on using L-Isoleucine, please make sure you combine it with the other branched chain amino acids, since this makes the amino acid most effective. For more information, please refer to our amino acid pages or contact a nutritionist to create a suitable nutrition plan.


Many athletes subjected to rigorous training could benefit greatly from an amino acid supplement. However, it is always recommended to contact a professional when you are in doubt about your nutrition and supplement routine.






Serving size: 350mg
Servings per package: 250g – 714, 1kg - 2857, 2kg - 5741


Average Quantity Per Serving

Average Quantity Per 100g
Energy 0 kJ 0 kJ
(0 Cal) (0 Cal)
Protein (dry basis) 0.0 g 0.0 g
Fat, total 0.0 g 0.0 g
- Saturated 0.0 g 0.0 g
Carbohydrate 0.0 g 0.0 g
- Sugars 0.0 g 0.0 g
Sodium 0 mg 0 mg
Potassium 0 mg 0 mg
L-isoleucine 350 mg 100 g

Ingredients: 100% pharmaceutical grade L Isoleucine
May contain traces of milk, soybeans, cereals containing gluten, tree nuts, sesame seeds and their products.

Formulated Supplementary Sports Food.
This product is not a sole source of nutrition and should be consumed in conjunction with a nutritious diet and an appropriate physical training or exercise program.

Not suitable for children under 15 years of age or pregnant women. Should only be used under medical or dietetic supervision.

Made in Australia from local and imported ingredients.


Directions for use:

As a dietary supplement consume 2g (1/2 teaspoon) with your preferred amount of water or fruit juice twice daily.

Serving suggestion:

L Isoleucine should be taken before or directly after a workout to assist with recovery.


100% pharmaceutical grade L Isoleucine.

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