The third term is the loss of cysteine in the reaction catalyzed by GCS that makes glutamyl-cysteine and the fourth term represents the loss of cysteine to other pathways (for example to sulfate and taurine)
For very light blonde or predominantly grey hair, the L-ascorbic acid in The Prevention may cause temporary warmth or brassiness at the roots if buildup occurs
(PubMed) Perrig WJ, Perrig P, Stahelin HB
Office workers, athletes, tradespeople, musicians, and gamers all share vulnerability to these painful conditions
2023;133:e169671
Multi-component materials require more documentation than a single-component listing because identity, allocation, homogeneity, and analytical interpretation may be reported differently