glutathione is made up of which amino acids Synthase - an overview Glutathione: Master Antioxidant, Reducing Oxidative

Even if a peptide becomes legally eligible for 503A compounding, pharmacies still need compliant API (and for many peptide use-cases, sterile injectable-grade supply) (FDA Law Blog)

For the 8mg/mL concentration, the same 2.5mg dose requires 31.25 units (0.3125 mL)

The concentration is just different from what you planned

Szakonyi, G

You may be vitamin B deficient if you experience some or all of the following unexplained symptoms: Skin cracks around the mouth Scaly lip skin Skin rashes Fatigue Anemia Depression or irritability Confusion Diarrhea or constipation Abdominal cramps Tingling or numbness in your feet and hands Vitamin B12 deficiency is particularly serious, as it increases your risk for neuropsychiatric disorders