Best Leucine Supplements – Top 10 Brands Ranked for 2018

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Are you looking for the best leucine supplements on the market this year? Then this is the right list for you. You can also get more info by jumping to our Leucine Supplements Guide.

Top 10 Leucine Products Compared

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1. BulkSupplements Pure L-Leucine Powder

BulkSupplements Pure L-Leucine Powder

Specs and Overview

  • This supplement is designed to be used as a bodybuilding supplement
  • Contains 1,500 mg of leucine in powder form.
  • This product is gluten-free.
  • The manufacturer recommends taking 2.5g twice daily.

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2. Micro Ingredients Plant-Based Instantized L-Leucine Powder

Micro Ingredients Plant-Based Instantized L-Leucine Powder

Specs and Overview

  • This supplement contains 2,500 mg of leucine per serving.
  • This product is vegan/vegetarian, non-GMO, kosher and plant-based.
  • Manufacturer recommends taking two or three servings per day.

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3. Source Naturals L-Leucine

Source Naturals L-Leucine

Specs and Overview

  • Contains 1.5 g of leucine per capsule (it is also available in powder form).
  • Gluten-free and free of sugar/salt, starch, yeast, dairy, egg, soy or artificial ingredients or preservatives.
  • The manufacturer recommends taking two or three capsules daily in between meals.

4. NutraBio 100% Pure L-Leucine

NutraBio 100% Pure L-Leucine

Specs and Overview

  • This supplement contains 3,000 mg of leucine per scoop.
  • This product is kosher, vegetarian, non-GMO, hypo-allergenic and free of fillers.
  • The manufacturer recommends taking one serving one or two times daily in water or juice.

5. Serious Nutrition Solutions Leucine

Serious Nutrition Solutions Leucine

Specs and Overview

  • Contains 5 grams of leucine per scoop.
  • This product contains no fillers.
  • Manufacturer recommends taking one to four scoops per day.

6. Nutricost Pure L-Leucine Powder

Nutricost Pure L-Leucine Powder

Specs and Overview

  • This supplement contains 5g of leucine per serving.
  • Contains no fillers.
  • The manufacturer recommends taking one-half to one scoop up to three times daily on an empty stomach with 8 oz. of liquid.

7. Allmax Nutrition Leucine Powder

ALLMAX NUTRITION Leucine Powder

Specs and Overview

  • Contains 5g of leucine per serving.
  • Produced in a facility which also handles common allergens (nuts, dairy, egg, soy, seafood).
  • Manufacturer recommends taking one serving twice per day mixed in a shake along with one serving immediately after a workout.

8. Muscle Feast Instantized L-Leucine

Muscle Feast Instantized L-Leucine

Specs and Overview

  • This supplement contains 2,800 mg of leucine per serving.
  • This product is pure and free from fillers.
  • The manufacturer recommends taking 2.5 to 3 grams per serving, two or three times daily between meals. Best when taken with carbohydrates.

9. Now Foods L-Leucine Powder

Now Foods L-Leucine Powder

Specs and Overview

  • This supplement contains 5g of leucine per serving in powder form.
  • Is vegan/vegetarian, non-GMO and gluten-free. It also contains non-GMO sunflower lecithin.
  • Manufacturer recommends taking one serving mixed into 8 oz. of water or another beverage from one to three times per day.

10. Infinite Labs L-Leucine

Infinite Labs L-Leucine

Specs and Overview

  • Contains 1g of leucine per serving in powder form.
  • This product is free from fillers.
  • The manufacturer recommends taking one scoop in 8 oz. of water or another beverage at least once per day.

What is Leucine?

According to the University of Arizona biology department, leucine is an essential amino acid the body uses to synthesize (process) proteins. Specifically, leucine is used to build proteins used for muscles, liver function and creation of connective (adipose) tissue.

Two things are most important to know about leucine: the body must have it, and the body cannot produce leucine on its own. This means that the only way the body can get the leucine it needs is from the food you eat or from taking it in a supplement form.

Of the three amino acids most essential for lean muscle production, Examine states, leucine is the most critical. Early research into how leucine acts in the body shows that adding additional leucine is a reliable way to build muscle over time. The studies also indicate less protein you naturally consume, the more reliable leucine is likely to be.

The National Institutes of Health (NIH) also states that, in many cases, the daily dietary intake of leucine is inadequate for most people’s needs (which likely explains the amount of ongoing research directed towards this essential amino acid).

However, it is clear that more research is needed to fully understand how to harness the properties leucine contains to build muscle and maintain optimal health.

Things to Look for in a Good Leucine Supplement

As you begin your search for the best leucine supplement, you will notice leucine is often packaged in a way where it is called “BCAA.” This stands for “branched chain amino acid,” and it is just a fancy way to stay “leucine.”

However, you do need to read the list of ingredients closely to make sure you know exactly what is in each supplement, since sometimes leucine is packaged as a BCAA supplement along with other ingredients or amino acids. It is always best to choose a pure product that is free from fillers or other ingredients.

Aiming for a high percentage of natural leucine in your supplement is important, since the National Institutes of Health (NIH) has reported that leucine has a higher rate of oxidation (to produce more energy for the muscles to use) than its fellow BCAAs. Also look for a trusted manufacturer, since use of leucine is still being researched.

How to Take a Leucine Supplement

If you have never taken leucine in a supplement before and you are not fond of bitter-tasting things, you may want to start with the capsule form rather than the powder, which can be quite bitter. If you want to take the powder, you can mix it in a smoothie, glass of juice or protein shake.

It is best to take leucine by following the manufacturer’s dosing instructions or as your doctor directs. How you take leucine should correspond to your goals. For muscle building, many athletes take leucine prior to, in the midst of and after workouts, breaking up their dose into three parts in this way.

It can also be helpful to take leucine right before bed so your body has access to the supplement for sleep-time muscle and body repair.