Several biological and lifestyle factors could be at play
What Happens if I Miss a Dose
For oral peptides, bioavailability is typically very low, often in the single digits, because the gastrointestinal tract destroys most of the compound before it can be absorbed
J Neurochem 114:820831 Scaturro D, Vitagliani F, Di Bella VE, Falco V, Tomasello S, Lauricella L, Letizia Mauro G (2022) The role of acetyl-carnitine and rehabilitation in the management of patients with post-covid syndrome: casecontrol study
Comparison table of glutathione formats: Format
Therefore, do not take its supplement or use topical products containing glutathione without consulting a doctor