Scientific evidence level, study limitations and primary literature references for each treatment used in the Skin Longevity protocol. Transparency is the foundation of clinical ethics.
This map is an editorial summary of selected sources, not a systematic search or formal GRADE assessment. Letters do not indicate product approval. Authorization, route and indication require product-specific verification. Sources and claims checked: 22 September 2026.
A double-blind, placebo-controlled trial in 264 participants supports the studied botulinum toxin A product for glabellar lines. Résultats do not automatically apply to every brand, dose or facial area.
A randomized trial in 60 participants compares CaHA with a particular hyaluronic acid filler for nasolabial folds. The complications review describes risks including vascular occlusion; it does not establish equivalence across all fillers.
A 16-week, uncontrolled study in 64 women reported improvements in skin measures. Without a comparison arm, the magnitude of benefit and superiority over alternatives remain uncertain.
Of 27 participants enrolled in a randomized trial, 19 were analyzed. Masked assessors found no significant difference, while participants reported improvement in some texture and wrinkle measures. Findings are mixed.
A histological study in six participants found no significant clinical or tissue-level rejuvenation with the tested mesotherapy mixture. This small negative study cannot settle efficacy for all formulations.
A 12-month comparative trial in 60 participants supports clinical outcomes with CaHA in nasolabial folds. This source is not evidence for PLLA, other dilutions or all body sites.
Systematic reviews report improvement in facial and neck tightening, with variation in devices, protocols and measurements. The adverse-event review shows why small efficacy studies cannot resolve every safety question.
An early human study of fractional photothermolysis describes microscopic treatment zones and short-term skin remodeling. This study alone does not validate every laser type or every scar indication.
A systematic review of acne scars includes 481 patients across 16 studies and reports promising outcomes. Parameters and methods vary; the findings should not be presented as proof of a general anti-aging effect.
A clinical review summarizes retinoid studies in photoaging. Tretinoin and cosmetic retinol differ in concentration, tolerability and evidence; they should not be treated as a single product.
In a randomized trial of 903 participants, regular sunscreen use reduced measured skin aging over 4.5 years compared with discretionary use. The result concerns a specific daily-use protocol.
A glycolic acid review summarizes uses, techniques and risks. A narrative review is not a systematic review; this source does not comparatively validate all salicylic acid protocols.
A narrative review describes vitamin C biology and formulation challenges. It does not establish the same clinical result for every serum or substantiate a particular improvement percentage.
A pigmentation study examines melanosome transfer and uneven pigmentation with topical niacinamide. A review discusses broader biological effects; clinical evidence is not equally strong for all signs of aging.
The nutrition and stress sources are narrative reviews; the sleep source is observational. Biological associations and observations are not randomized evidence that a particular lifestyle program rejuvenates skin.