Compounded Glutathione (GSH)

Glutathione (GSH) is a tripeptide of glutamate, cysteine, and glycine that every cell in your body produces. It is the master endogenous antioxidant — it neutralizes reactive oxygen species, regenerates vitamins C and E to their active forms, and serves as the substrate for phase II liver detoxification. GSH levels naturally decline with age and are depleted by alcohol, intense training, certain medications, and chronic inflammatory states. Restoring circulating GSH supports your body’s built-in cellular defense system.

Oral glutathione has historically had poor bioavailability — the digestive tract breaks most of it down into its component amino acids before absorption, so very little intact GSH reaches circulation. Subcutaneous injection bypasses the gut entirely and delivers reduced glutathione directly into the bloodstream, where it can be taken up by tissues. Newer liposomal oral forms have improved on standard oral absorption, but injectable GSH remains the most direct way to raise circulating levels.

Subjective effects — better recovery, clearer head after alcohol or travel, less post-workout fatigue — are commonly reported within 2–4 weeks of consistent dosing. Skin tone or complexion changes, when they occur (off-label), typically take 8–12 weeks of regular use. Antioxidant capacity changes are happening at the biochemical level from the first dose, but the felt experience varies based on baseline oxidative stress, sleep, and overall health.

Glutathione is widely used off-label for skin brightening, particularly in cosmetic and IV-bar settings. The mechanism involves shifting melanin synthesis from darker eumelanin toward lighter pheomelanin and reducing oxidative pigmentation. Published evidence is mixed and dose-dependent, results vary widely by individual, and the FDA has not approved glutathione for any cosmetic indication. Peptide12 prescribes glutathione for antioxidant and cellular defense support; any cosmetic effect is off-label and not guaranteed.

Glutathione has a generally favorable safety profile, but the most important interactions are with sulfa and sulfite-containing medications and preservatives, with chemotherapy drugs (where antioxidant supplementation may interfere with treatment intent), and in patients with severe asthma where sulfite preservatives can trigger bronchospasm. Your prescribing doctor reviews your full medication list and allergy history at intake before any starting dose is approved.

Peptide12 partners with state-licensed compounding pharmacies that hold state and federal licensure and undergo regular USP <797> sterility audits. Every batch is third-party tested for identity, potency, sterility, and endotoxin before release. Compounded glutathione is not FDA-approved as a finished drug product but is prepared from pharmaceutical-grade reduced glutathione under individualized prescription within the 503A compounding framework.

IV glutathione delivers a higher peak dose in a single sitting and is the format most common in clinics and IV bars — often 1,000–2,000 mg per infusion. Subcutaneous (SC) glutathione delivers a smaller dose more frequently (typically 200–600 mg, 2–3x weekly) and can be self-administered at home, similar to other compounded peptides. SC dosing maintains a steadier baseline of circulating GSH and avoids the cost and logistics of weekly clinic visits.

Yes. A common protocol is 8 weeks on followed by 2 weeks off, which supports your body’s endogenous synthesis machinery and prevents downregulation. Some patients run continuous low-dose maintenance instead. Your prescribing doctor will recommend a cycling pattern based on your goals, baseline oxidative stress markers if available, and how you respond over the first 8–12 weeks.