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Leucine is a great choice for athletes and bodybuilders alike. Leucine has been shown to be the most powerful amino acid around when its comes to protein synthesis and can therefore help with recovery, performance and weight loss. We stock 500g and 1kg packs.  Discounts start at 3.4% for a 2 pack of 500g and go up to over 16% for 15 x 1kg packs. Stock up or share, either way you’ll save with Professional Whey!

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Amino Acids


5 out of 5 stars, 9 reviews

Leucine has been shown to be the most powerful amino acid supplement that assists with increasing protein synthesis. It also assists with recovery, performance and surprisingly even fat loss. Our Leucine is now soy free and is INSTANTISED with SUNFLOWER LECITHIN for easy mixing, less waste and has a less bitter taste, benefiting sports athletes and body builders alike.

Bulk Buy Discounts

2x500g for $28 each
3x500g for $27 each
4x500g for $26 each
5x500g or more for $25 each
10x500g or more for $23 each
15x500g or more for $22 each
from $29.00

Serving Size: 1 tsp (5g)                        Servings Per Package: 100

Our Pharmaceutical Grade Leucine is now soy free and 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.

It 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.

Studies have shown that Leucine may assist with:

  • Increasing protein synthesis (Norton et al, 2006)
  • Improving power and endurance (Crowe et al, 2006)
  • Increasing speed of recovery (Anthony et al, 1999)
  • Increases in fat loss (Layman et al, 2003)

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

Customer reviews

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  • 5

    Recovery & Gains

    Posted by on 07 Oct 2016

    Absolutely top quality Leucine has helped my recovery no end and have noticed some gains already,definitely be back for more !!

  • 5

    Instantised leucine

    Posted by on 14 Aug 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.

  • 5

    A must have, cannot go without.

    Posted by on 19 Jul 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.

  • 5

    outstanding product

    Posted by on 23 Apr 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.

  • 4

    A great Amino

    Posted by on 29 Mar 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.

  • 5

    instantised leucine

    Posted 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

  • 5


    Posted by on 12 Jun 2014

    So good, mixes easily and quickly. High quality product and excellent for helping to spike insulin post training!

  • 5

    Speeds recovery!

    Posted by on 06 Jan 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.

  • 5

    Mature Triathletes

    Posted by on 25 Dec 2012

    We run,swim or ride everyday and the Whey & L-Leucine helps big time with our recovery

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