Any compounding pharmacy offering retatrutide is operating in a legally questionable space
Oral administration of GSH is not very effective, however, because it is poorly absorbed through digestion and insufficient amounts cross the blood-brain barrier

Common side effects (minimal) Most people: No side effects GHK-Cu extremely well-tolerated Natural peptide (found in body) Minimal adverse effects Possible minor effects: Injection site stinging (common, harmless) Minor bruising at injection sites Slight blue tint to injection site (copper, temporary) Mild headache (rare) Managing side effects: Stinging: Inject slowly, warm peptide to room temp Bruising: Rotate sites, proper technique Blue tint: Normal, fades within days Headache: Hydrate well, reduce dose Contraindications and cautions Avoid if: Pregnancy or breastfeeding (no data) Active cancer (theoretical copper concerns) Wilson's disease (copper metabolism disorder) Hemochromatosis (iron overload, copper caution) Use caution with: Copper supplements (avoid taking both) High copper foods (monitor intake) Liver disease (copper metabolism) Generally safe for: All ages (adults) Men and women Long-term use Most health conditions Copper toxicity concerns Is copper in GHK-Cu dangerous

Cellular methylation and NAD pool dynamics the only well-characterized chemical probe that simultaneously raises tissue NAD and SAM, enabling clean studies of the methyl-donor / NAD-salvage interface [1,2]
64 A 90-day administration of dexamethasone (DEX) resulted in significant declines in both BMD and BMC, along with substantial increases in serum levels of glucose, insulin, triglycerides, total cholesterol, parathyroid hormone (PTH), osteoprotegerin (OPG), and bone resorption markers including deoxypyridinoline (DPD), N-terminal telopeptide of type I collagen (NTX-1), and TRAP-5b