If irritation such as inflammation, redness or itch occurs for more than 3 days, discontinue use
Skin hydration, wrinkling, and elasticity were assessed at baseline and after 12 weeks, with adjustments for temperature, humidity, and ultraviolet A light exposure (using weather data during the evaluation intervals)
2018, titled Le traitement par thiamine (vitamine B1) dans lalcoolodpendance [Thiamine (vitamin B1) treatment in patients with alcohol dependence]. After stabilization from detox, transition to oral doses such as 250500 mg/day for weeks to months is typical, according to Dervaux A, et al
J Cardiovasc Pharmacol 70:382389
Results Inhibition of glutathione metabolism depletes neuronal glutamate and affects excitatory transmission To test the hypothesis that glutathione is a significant reservoir for glutamate, we treated neuronal cells with molecular inhibitors targeting enzymes of the glutathione metabolic cycle: L-2-imidazolidone-4-carboxylate (2I4C), acivicin, L-buthionine sulfoximine (BSO), and sulforaphane
Taking care of your skin with a routine you can stick with will get you those same results, so feel free to experiment with what works best for you