doi: 10.1007/S40495-019-00196-3 206 ZamboniF.WongC
Most patients notice faster recovery between workouts and noticeably better sleep within the first two to four weeks
Presented for research literature review only Lee E et al
Prevalence of long COVID in a national cohort: longitudinal measures from disease onset until 8 months follow-up
A 2022 double-blind, benchmark- and placebo-controlled RCT by Duperray, Sergheraert, and colleagues in the Journal of Cosmetic Dermatology (n=124 Asian women, 12 weeks) found that oral L-cystine plus reduced L-glutathione significantly lightened skin and reduced facial dark spot size at both 6 and 12 weeks versus placebo
It was included as a tertiary agent in the 2017 edition of the multi-agency clinical guidelines for the treatment of hypertension (Whelton et al, 2018), but was no longer mentioned in the 2025 AHA/ACC multisociety hypertension guidelines (Jones et al, 2025)