kirkland glutathione collagen + Collagen: Brightens skin tone and promotes healthy hair and nails Glutathione Collagen Gummies - Brighten

doi: 10.3892/ol.2012.931

For hair growth, the credible endpoints are well established standardized global photography assessed by blinded evaluators, and target-area hair counts and density measured by trichoscopy or phototrichogram at fixed scalp sites over a sufficient duration (typically 24 weeks or more, because the hair cycle is slow)

Mod Chem Appl 1:12 Sung H, Ferlay J, Siegel RL, Laversanne M, Soerjomataram I, Jemal A, Bray F (2021) Global cancer statistics 2020: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries

Cutting the cycle short at 8 weeks may produce reduced shedding but will miss the density gains that come at 4 to 6 months