Body composition evidence brief
Soy protein isolate can support resistance-training adaptations when total protein and leucine are adequate, but it is not superior to whey or complete protein intake.
Leucine-matched RCT: LBM +1.54 kg and leg-extensor torque +40.27 Nm across soy and whey groups.
Dose to match total protein and essential amino acid targets; leucine-matched comparisons are more informative than scoop-for-scoop comparisons.
Product quality matters: amino acid profile, dose math, contaminants, taste, tolerance, and price can vary materially between soy products.
Source Drawer
The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.
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