Chlorophyll for Skin Health
Evidence that chlorophyll helps skin is weak and disputed: a few small, mostly industry-funded studies of topical copper chlorophyllin and chlorophyll-based light therapy show modest signals for acne and photoaging, but the heavily marketed oral "chlorophyll water" has no supporting clinical trials at all. Treat it as a low-evidence cosmeceutical, not a proven skin treatment, and note real safety caveats.
Why this grade7-layer evidence engine
This earns a weak, disputed grade because the human evidence is small, low-quality, and only covers applied-to-skin or light-therapy uses, not the oral supplements consumers actually buy. The one genuine randomized trial (PMID 24930587, n=24) found chlorophyll-a plus LED light beat LED alone for acne, but it tests chlorophyll as a light-activated agent, not a standalone product, and its comparator was light-only rather than a sham. An earlier split-face pilot (PMID 21254857) gave only a preliminary positive signal.
The remaining studies are fragile. Two single-arm pilots of topical copper chlorophyllin (PMID 26091384 for acne and pores; PMID 25844615 for photodamage, each n=10) improved scores versus baseline but had no placebo, so regression and vehicle effects cannot be excluded. A 4-person biopsy study (PMID 27524916) raised skin-repair biomarkers, which supports plausibility but not visible benefit. All three were funded by the product's developer, with overlapping authors, a clear conflict of interest.
Authorities reinforce caution rather than endorsement. The FDA permits sodium copper chlorophyllin only as a color additive and has warned sellers making acne and detox claims for liquid chlorophyll; EFSA rejected chlorophyll health claims, while WHO's favorable rating concerns colorant safety, not efficacy. Cleveland Clinic notes the roughly 10-person study sizes and warns chlorophyllin can increase sunburn risk; Mayo, Harvard, the AAD, and the UK NHS do not address it, and Examine has no entry.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.423
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 無高階證據可裁決
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 1 個 hard + 1 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status