Hydration evidence brief
Glycerol is a hyperhydration ingredient used to increase fluid retention before endurance work. It is commonly promoted for heat tolerance, sweat-heavy sessions, and pump-style claims.
Can increase fluid retention before long hot events, but performance benefits are inconsistent and context-specific.
Hyperhydration meta-analyses support fluid retention; performance benefit depends heavily on heat and event context.
Usually paired with large fluid volumes in hyperhydration protocols, which limits practicality.
Not useful for normal lifting sessions and may cause gastrointestinal discomfort.
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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