Studies show Leucine may assist in:

  • Increasing Protein Synthesis1
  • Improving Power and Endurance2
  • Increasing Speed of Recovery3
  • Increases in Fat Loss4
5 out of 5 stars from 9 reviews
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Leucine has been shown to be the most powerful amino acid supplement that may assist with:

  • Increasing Protein Synthesis
  • Improving Performance
  • Improving Recovery
  • Increasing Fat Loss

Our Pharmaceutical Grade Leucine is instantised for easy mixing with sunflower lecithin, creating less waste and a less bitter taste. It is made from Non GMO corn glucose and is suitable for vegans.

L-Leucine is one of three essential branched chain amino acids (BCAAs) and has been used for many years in conjunction with other BCAA’s (L-Valine and L-Isoleucine) as a supplement to help improve recovery and preserve muscle tissue.

However, more recently L-Leucine has emerged to be the most potent and beneficial of all of the BCAA’s after recent research suggesting that the high concentrations of L-Leucine in muscle tissue is responsible for the many benefits of taking BCAA’s and high protein foods. This is primarily because Leucine has been shown to activate the anabolic signalling mTOR pathway which is responsible for muscle anabolism.

Leucine has since been coined the "limiting nutrient", meaning without enough of it in proportion to other amino acids, we may not be making full use of what we eat. It is therefore a great amino acid to add to your protein shakes or other high protein foods.

Available in 500g and 1kg packs and bulk buy discounts.


1: Norton et al, 2006, 2: Crowe et al, 2006, 3: Anthony et al, 1999, 4: Layman et al, 2003

Studies show Leucine may assist in:

  • Increasing Protein Synthesis1
  • Improving Power and Endurance2
  • Increasing Speed of Recovery3
  • Increases in Fat Loss4

Add 5g to pre and post workout shakes and to other high protein meals.

And also stacks well as part of:

The Ultimate Stack (Pre (30 mins) & Post Workout (Immedietely) - Drink Half Pre Workout and Half Post Workout)
600-1200ml of Water
(3g) 1/2 tsp Creatine Monohydrate
(5g) 1 tsp Glutamine
(3g) 1 tsp HMB Powder
(10g) 2 tsp IBCAA or Leucine 4:1:1
(5g) 2 tsp Betaine Anydrous TMG
(4g) 1 tsp Beta Alanine
(4g) 1 tsp Taurine
(6g) 2 tsp Citrulline Malate 2:1
(4g) 1 & 1/3 tsp Arginine AAKG

Add protein if required i.e (Pre & Post) 1/2 - 1 scoop of Hydrolysed Protein

Add carbs if required i.e (Pre) 1/2 scoop of Organic Instant Oats (Post) 1 scoop Maltodextrin/Dextrose

If you want to make it in bulk then the following makes up approximately 100 serves:

300g Creatine Monohydrate
500g Glutamine
300g HMB Powder
1kg IBCAA 4:1:1 or Leucine
500g Betaine Anydrous TMG
400g Beta Alanine
400g Taurine
600g Citrulline Malate 2:1
400g Arginine AAKG

Add protein if required i.e 100 serves you will need 2-3kg Hydrolysed Protein

Add carbs if required i.e 100 serves you will need (Pre) 2kg Ultra Fine Organic Oats and (Post) 4kg Maltodextrin/Dextrose.

Serving Size: 1 tsp (5g)

Servings Per 500g: 100

Ingredients: Pure Pharmaceutical Grade L-Leucine, 0.8% Sunflower Lecithin

Recovery & Gains

By: on 7 October 2016
Absolutely top quality Leucine has helped my recovery no end and have noticed some gains already,definitely be back for more !!

Instantised leucine

By: on 14 August 2016
Superior product well worth the extra cost. Mixes easily in water with a spoon. Mixes clear no froth or clumps and no residue. Totally absorbed. No waste. Can be drunk alone prior to meals to add leucine and protein content of meal and bioavilability. Great for us over 50s as our ability to absorb protein is diminished. Can be added to protein shakes, yogurt or meals.

A must have, cannot go without.

By: on 19 July 2016
This product is the real deal and works. It has saved me during my weight lifting sessions especially during my dieting phase maintaining my muscle mass. It does mix easy but i just chase down a scoop when needed with water too easy. Great product.

outstanding product

By: on 23 April 2016
Proffessional Whey's Instantised Leucine is an outstanding product. It mixes clear in water with just a few stirs with a spoon. No foaming or clumping no wastage. Unlike others low quality Leucine products on the market . It is virtually tasteless so great to add to any protein shake oe foods to increase Leucine content and increase the anabolic effect. A great product especially for us over 50s who dont 'metabolise protein as efficiently as we once did.

A great Amino

By: on 29 March 2016
I have been using Leucine for several months and mix a teaspoon with my NZ WPI and a teaspoon of Creatine for my post workout shake. Leucine has been found to be a key trigger for the muscle building response to training. I have found this product to be of a high quality. Some people say that they drink it during a workout, but I found it to give me indigestion and the true of the matter is that as long as your total macros are met at the end of the day: it does not matter when you take them.

instantised leucine

By: on 23 May 2015
mixes easily with a spoon no froth or clumping. virtually tasteless. Boosts quality of any protein source. Great for over 4os who need extra help absorbing and utalising protein. Great product well worth paying extra for an instantised product


By: on 12 June 2014
So good, mixes easily and quickly. High quality product and excellent for helping to spike insulin post training!

Speeds recovery!

By: on 7 January 2014
I'm a Master Laser sailor and after a big day on the water of even after a gym session when those muscles are aching, a teaspoon mixed in with my egg white and fruit smoothie really accelerates my recovery. Take within the 30-minute post exercise window.

Mature Triathletes

By: on 26 December 2012
We run,swim or ride everyday and the Whey & L-Leucine helps big time with our recovery

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