Using fine needles (30-32 gauge) minimizes discomfort and bruising
The most significant marker, considered a gold standard, was F2-isoprostane and this was significantly more reduced by oral Acetylglutathione than with the IV glutathione.[11],[12] Oral S-Acetyl Glutathione, dosed 200mg daily for 7 days, AM IV 1400mg, single dose Serum and urine tested after 1 week of administration N=6, (4 female, 2 male, average age 45) Markers chosen are measures of Antioxidants F2-Isoprostane is the Gold Standard of oxidative stress markers Conclusion: Oral S-A GSH compares favourably to a one-time, equivalent dose of IV administered Glutathione GSH : Blood levels are lower in the A-GSH group as compared to the IV group because the A-GSH is being taken up by the cell.[13] This is substantiated by the following markers: F2-Iso : (F2- isoprostane ) measurement of redox status and oxidative stress

Gourh P, Safran SA, Alexander T, Boyden SE, Morgan ND, Shah AA, Mayes MD, Doumatey A, Bentley AR, Shriner D, Domsic RT, Medsger TA Jr, Ramos PS, Silver RM, Steen VD, Varga J, Hsu V, Saketkoo LA, Schiopu E, Khanna D, Gordon JK, Kron B, Criswell LA, Gladue H, Derk CT, Bernstein EJ, Bridges SL Jr, Shanmugam VK, Kolstad KD, Chung L, Kafaja S, Jan R, Trojanowski M, Goldberg A, Korman BD, Steinbach PJ, Chandrasekharappa SC, Mullikin JC, Adeyemo A, Rotimi C, Wigley FM, Kastner DL, Boin F, Remmers EF (2020) HLA and autoantibodies define scleroderma subtypes and risk in African and European Americans and suggest a role for molecular mimicry
doi:10.1385/0-89603-268-X:329
And our answer, based on years of experience in peptide synthesis and laboratory best practices, is just as simple