Weight-loss supplements debunked · what works, what's a scam减肥补剂大盘点 · 哪些有证据, 哪些是智商税

Place · Level 3 · Debunk

$30B/年市场 · 多数 RCT 证据微弱或缺失 · 没有补剂减重超过 1-2 kg · 与 GLP-1 阶梯相差一个数量级

$30B myth · regulatory truth

Stop 1/5

$30B 神话 · 监管真相

Global weight-loss supplement market > $30B/year, ~ 60% of US adults have tried at least one (NIH ODS 2023). The marketing playbook never changes:

'Natural = safe = effective''No diet, no exercise needed''Burns stubborn fat' / 'Blocks carbs/fat absorption''Celebrity X lost 20 lbs in 30 days'
FDA does not pre-approve supplements (DSHEA 1994): supplements are classified as 'food'; manufacturers don't need to prove efficacy or safety before selling. FDA can only recall after harm (e.g., ephedra was banned in 2004 only after deaths). This means most fat-loss miracle pills on the shelf have never passed a single RCT.

The reference table (memorize before reading any ad):

Intervention	6-12 mo weight loss	Evidence
Any supplement	0-2 kg	weak / none
Diet + exercise (lifestyle)	5-10 kg	strong
GLP-1 (semaglutide 2.4 mg)	~15 kg	very strong (STEP-1)
GIP/GLP-1 (tirzepatide 15 mg)	~21 kg	very strong (SURMOUNT-1)
Bariatric surgery (sleeve/RYGB)	25-35% TBW	very strong

Bottom line: no marketed supplement has achieved ≥ 2 kg / 6-month clinically meaningful weight loss in rigorous RCTs. You're probably buying a placebo + marketing + packaging. The next three pages dissect the categories: ① things with weak signals (green tea / CLA / vinegar), ② pure fraud (raspberry ketone / synephrine / Garcinia), ③ the 'natural adaptogen' trap (Ashwagandha et al.).

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