COMPARE
PopulationAdults in a structured resistance-training programAdults with regular daylight exposure
EvidenceSTRONG · MODERATESTRONG · MODERATE
RiskLOWLOW
TimeframeWeeks to months of consistent intake alongside training.Years. This is a long game with a visible payoff.
The decisionThe highest-leverage nutrition change for most people who train. Total daily intake beats nutrient timing.The single best-supported daily skin intervention. Boring, proven, cumulative.