Proof.Fit

Leucine

17 benefits mapped to clinical evidence across supplements.

Benefit Evidence

MPS + leucine

Muscle size/gain +

3,420 people

+lean mass, body weight

-muscle loss, protein breakdown

3,421 people

Muscle gain + performance

Mortality/cognition benefits

-

6,625 people

Anabolism + recovery

Less catabolism, shorter stay

BCAA/leucine support healing

1,879 people

Glucose/insulin ↓

Liver fat/IR ↓

4,453 people
Strength
Strong

Strength +5-15%

Strength +20 kg

1,773 people
Blood sugar
Moderate

↑ insulin, ↓ glucose

↓ insulin resistance

699 people

MPS recovery +30-145%

Less breakdown/soreness

568 people

MPS + performance

Strength + recovery

623 people

Immune markers +

Inflammation down, immunity up

362 people
Fat burn
Moderate

Fat loss +4.7 kg

Fat oxidation +33.6 g/d

248 people
Endurance
Moderate

Endurance +18.1 m

Muscle preservation +1,019 g

380 people
Skin repair
Moderate

Protein balance + synthesis

Wound repair + collagen

340 people

Leucine/AA ↑ satiety, CCK

Whey/BCAA ~13% intake ↓

106 people

Vitamin D/PTH: +2% BMD

Leucine EAA: BMC preserved

440 people

Cognition +10.6%

Attention/reaction time

Protein synthesis

71 people

Reduced soreness; no detail

Lower soreness, +5% strength

41 people