COMPARE
PopulationAdults with irregular schedulesAdults with regular daylight exposure
EvidenceMODERATE · MODERATESTRONG · MODERATE
RiskLOWLOW
TimeframeTwo to four weeks of regularity before it compounds.Years. This is a long game with a visible payoff.
The decisionFree, unglamorous, and more reliable than most products. Fix the wake time first; the rest follows.The single best-supported daily skin intervention. Boring, proven, cumulative.