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Head-to-head evidence comparison — which supplement is right for you?
Andrographis and Tretinoin (Retin-A) are closely matched across evidence, studies, and safety.
Verdict
Probably helps
4 of 8 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
400mg extract (standardized to 10-30% andrographolides), 3x daily for acute use
At first sign of cold symptoms, With meals
Standardized extract (10-30% andrographolides)
Prescription topical: a pea-sized amount of 0.025%-0.1% cream or gel applied to clean, dry skin once nightly. Start low-strength and every-other-night to build tolerance. A prescription drug used under clinician direction — not a supplement regimen.
before-bed
Topical cream or gel, 0.025%-0.1% (prescription)
2-5 days
2-5 days
2-5 days
12-24 weeks
12-24 weeks
Months
8-12 weeks
Herbal Medicines for the Treatment of Active Ulcerative Colitis: A Systematic Review and Meta-Analysis
Nutrients (2024) · Meta analysis
In pooled analyses, when compared with placebo, clinical response rates were significantly higher for Indigo naturalis (IN) (RR 3.70, 95% CI 1.97-6.95), but not for Curcuma longa (CL) (RR 1.60, 95% CI 0.99-2.58) or Andrographis paniculata (AP) (RR 0.95, 95% CI 0.71-1.26).
Safety of Andrographis paniculata: A systematic review and meta-analysis
Pharmacoepidemiology and drug safety (2021) · Meta analysis · n=1000
Incidence of serious AEs was very rare with the pooled incidence (95% CI) from RCTs of 0.02 per 1000 patients (0.0-0.5).
A double-blind, randomized, placebo-controlled study to assess the efficacy of Andrographis paniculata standardized extract (ParActin®) on pain reduction in subjects with knee osteoarthritis
Phytotherapy research : PTR (2019) · Rct · n=103
Patients treated with 300 or 600 mg/day of ParActin® showed a significant reduction in pain at days 28, 56, and 84 compared with a placebo group.
Topical tretinoin improves photoaged skin. A double-blind vehicle-controlled study.
JAMA (1988) · Rct
Randomized, double-blind, vehicle-controlled trial of topical tretinoin for photoaged forearm and facial skin
Tretinoin emollient cream: a new therapy for photodamaged skin.
J Am Acad Dermatol (1992) · Rct
Multicenter double-blind vehicle-controlled trial of tretinoin emollient cream for photodamaged skin
Long-term treatment of photoaged human skin with topical retinoic acid improves epidermal cell atypia and thickens the collagen band in papillary dermis.
J Am Acad Dermatol (2005) · Open label
Long-term topical retinoic acid on photoaged human skin assessed histologically
Based on RCT showing significant improvement in cough (SMD -0.39) and sore throat symptoms. Conservative effectiveness estimates due to moderate effect sizes in meta-analysis of respiratory infections.
AI-estimated from published studies. Interpret as directional guidance.
Both Andrographis and Tretinoin (Retin-A) are closely matched — the best choice depends on your specific health goals.
No known interactions between Andrographis and Tretinoin (Retin-A) have been documented in our database. However, always consult a healthcare provider before combining supplements.