Supplemental material Intervention and placebo The active substance of vitamin B 12 given in the study is 2 mL mecobalamin (5 mg/ml), administered intramuscularly.25 Placebo substance is 2 mL sodium chloride (9 mg/ml), isotonic solution for parenteral use (Baxter) intramuscularly.26 All participants are informed that their urine may turn red, which may occur during mecobalamin injections
Understanding B12's neurological importance helps contextualise concerns about its potential effects on anxiety
Nature Reviews Endocrinology, 13(4), 220-231
Bacteriostatic Water 3ML Bacteriostatic Water is sterile, non-pyrogenic water infused with 0.9% benzyl alcohol as a preservative
SkinMedica Total Defense + Repair Broad Spectrum Sunscreens (SPF 34 and SPF 34 Tinted) and Essential Defense Broad Spectrum Sunscreens (Everyday Clear SPF 47, Mineral Shield Tinted SPF 32, and Mineral Shield SPF 35) are over-the-counter drug products which are formulated and marketed pursuant to FDAs governing regulations set forth at 21 CFR Part 352