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2.5/5 Weak evidence

Endurance evidence brief

Sodium phosphate loading

Phosphate loading has a plausible oxygen-delivery rationale, but modern performance findings are inconsistent and less useful than better-proven endurance aids.

Inconsistent endurance case endurance 6 linked sources Content audit 2026-05-04

Headline Finding

Reviews and cycling trials are mixed; plausible oxygen-delivery mechanisms have not produced reliable modern outcomes.

Dose Context

Loading protocols are short-term, sodium-heavy, and sport-event specific; they are not daily gym supplements.

Important Caveat

Phosphate dose, sodium load, renal considerations, and event-specific claim wording are central to product judgment.

Source Drawer

Linked Research

6 papers and evidence links - audit 2026-05-04
  1. Systematic review Mineral performance systematic review
  2. Review Phosphate loading review
  3. Trial Cycling time-trial null RCT
  4. Trial Oxygen delivery trial
  5. Trial Cycling time trial PDF
  6. Trial Female cycling time trial PDF

How To Read This Rating

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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