Short answer: Acetic acid does have published effects on post-meal glucose response, and this is the better-supported ACV claim. Effect sizes are modest and vary by dose and format — and the dose here is undisclosed.
Why this claim is treated separately from the weight-loss claim
None of this means apple cider vinegar is harmful or useless — the post-meal glucose research is separate and still stands, unaffected by the 2025 retraction of the weight-loss study.
Why "modest" and "varies by dose" are honest qualifiers
Effect sizes are modest and vary by dose and format — genuinely different language than a headline "stabilizes blood sugar" claim would suggest, and more accurate.
Why glucose response and weight loss are genuinely different claims
The weight-loss claim specifically lost its supporting trial to retraction in 2025. Glucose response and weight loss are not the same claim, and conflating them is exactly what much of the marketing in this category does.
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