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Head-to-head evidence comparison — which supplement is right for you?
Lactoferrin vs Tretinoin (Retin-A): Tretinoin (Retin-A) has the stronger overall evidence (8 vs 6.3/10); the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Tretinoin (Retin-A) wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
200–300 mg daily for adults; 100–200 mg/day for children
30–60 minutes before breakfast, Between meals on an empty stomach
Bovine lactoferrin capsule or powder (≥95% purity)
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)
4–8 weeks of use
4–8 weeks
4–8 weeks
6–12 weeks
12-24 weeks
12-24 weeks
Months
8-12 weeks
Effect of Lactoferrin Supplementation on Inflammation, Immune Function, and Prevention of Respiratory Tract Infections in Humans: A Systematic Review and Meta-analysis.
Advances in Nutrition (2022) · Meta analysis
Lactoferrin significantly reduced IL-6 in adults (mean difference: -24.9 pg/mL; 95% CI: -41.64, -8.08 pg/mL)
Lactoferrin reduces the risk of respiratory tract infections: A meta-analysis of randomized controlled trials.
Clinical Nutrition ESPEN (2021) · Meta analysis
Pooled analysis of RCTs showed significant reduction in respiratory tract infection risk with lactoferrin supplementation
Comparative Effects between Oral Lactoferrin and Ferrous Sulfate Supplementation on Iron-Deficiency Anemia: A Comprehensive Review and Meta-Analysis of Clinical Trials.
Nutrients (2022) · Meta analysis
Lactoferrin was non-inferior to ferrous sulfate for increasing hemoglobin and serum ferritin
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 multiple meta-analyses showing OR 0.78 for RTI reduction. Effect more pronounced in children and preterm infants. Conservative estimates due to heterogeneity in populations studied.
AI-estimated from published studies. Interpret as directional guidance.
Tretinoin (Retin-A) has a higher evidence score (8/10 vs 6.3/10) and wins in 2 of 3 categories.
No known interactions between Lactoferrin and Tretinoin (Retin-A) have been documented in our database. However, always consult a healthcare provider before combining supplements.
AM/PM order, what to combine vs separate, and why sunscreen always comes first.
The proven core (sunscreen, retinoids, vitamin C) vs the viral hype tier — honestly tiered.
The depigmenter playbook (hydroquinone, azelaic, tranexamic, vitamin C) with sunscreen as the spine.
Bakuchiol vs retinol vs adapalene vs tretinoin — pick by strength and tolerance, not hype.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.