The global anti-aging supplement market exceeds $50 billion annually and grows at double digits. The ratio of marketing to evidence in this category is, charitably, poor. Here is what the clinical literature actually supports, and what it does not.
Understanding What Drives Skin Ageing
Skin ageing has two components: intrinsic and extrinsic. Intrinsic ageing is genetically programmed and involves the gradual decline of collagen synthesis, reduced cellular turnover, and accumulated mitochondrial DNA damage. Extrinsic ageing, primarily photoageing from UV exposure, is the dominant driver of visible facial ageing and accounts for approximately 80% of skin changes. Any supplement strategy addressing ageing needs to engage with both mechanisms to be meaningful.
What Has Strong Evidence
Hydrolysed collagen peptides have the most strong clinical evidence of any supplement specifically targeted at skin ageing. Multiple RCTs and now several meta-analyses confirm improvements in skin elasticity, hydration, and wrinkle depth with 8-24 weeks of consistent supplementation. The mechanism, stimulation of fibroblast collagen production via bioactive peptide signalling, is well-characterised.
Astaxanthin, the carotenoid that gives salmon its pink colour, has a growing evidence base as a photoprotective antioxidant. Research in Acta Biochimica Polonica and Journal of Clinical Biochemistry and Nutrition documents improvements in skin elasticity and moisture with astaxanthin supplementation, with proposed mechanisms including protection against UV-induced reactive oxygen species.
Vitamin C and vitamin E, particularly in combination, provide antioxidant defence that partially offsets the oxidative damage from UV exposure that drives photoageing. This is the evidence-based argument for supplementing these nutrients even if dietary intake appears adequate in individuals with high UV exposure.
What Has Interesting but Incomplete Evidence
Nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) as NAD+ precursors have generated enormous research interest following cellular longevity work by David Sinclair and others. Human clinical trials confirm that they raise blood NAD+ levels, but the downstream skin and ageing outcomes in humans remain incompletely characterised. Promising, but premature for definitive recommendations. Resveratrol suffers from poor oral bioavailability that limits translation of cell culture and animal research to humans.
The Lifestyle Foundation
No supplement stack overrides inadequate UV protection. Consistent SPF 30+ use is the single most evidence-supported intervention for preventing skin ageing. Beyond that, adequate sleep (during which growth hormone peaks and cellular repair occurs), not smoking (smoking dramatically accelerates skin ageing through direct ROS generation and reduced microcirculation), and adequate hydration form the non-negotiable foundation. Supplements work at the margin, and at the margin, the collagen plus vitamin C stack is where evidence is strongest.
Supplement your skin with what the research actually backs. Inside Job Beauty by Convict Labs, no hype, just the evidence-based ingredients that make a real difference. Shop Convict Labs.
