l-glutathione while breastfeeding 12 Simple Strategies to Support and Milk Supply — Seeking Health Is Glutathione Good for Breastfeeding
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No, for a reconstituted peptide solution like BPC 157, passing through a 30G or 31G needle will not damage or degrade the compound

A comprehensive description of the GSH detection studies has been reported

Unveiling the power of microenvironment in liver regeneration: an in-depth overview

doi: 10.1242/jeb.121947 39 GhezziP.FloridiL.BoraschiD.CuadradoA.MandaG.LevicS.et al