can glutathione be absorbed sublingually Sublingual vs Injectable Glutathione: Which Form Gets Better Results? How to Take Oral Glutathione:

These found no evidence of organ toxicity, no genetic damage, and no developmental defects at doses far higher than what would be used therapeutically

Nanobiotechnology 19, 255

This compound is a well-known extremolyte a type of small organic molecule that can protect cells under extreme, virtually [un]inhabitable conditions.7 In addition to protecting the skin from intense stress, ectoine also appears to improve the stability of various peptides by strengthening their hydration shell.8 Some research suggests that GHK-Cu (the copper peptide used in most copper peptide products) may have insufficient stability and could be prone to decomposition by skin proteases.9 Theoretically, then, the inclusion of ectoine in Allies of Skin Copper Tripeptide & Ectoin Advanced Repair Serum might be able to promote better stability and efficacy of the peptide

Synthetic Polypeptides (4199 amino acids): Subject to separate evaluation criteria