hemoglobin oxidized glutathione is an oxygen-dependent buffer adapting the intracellular reduced glutathione levels to oxygen availability L-glutamine for sickle cell disease:

Fortin DA, Srivastava T, Dwarakanath D, Pierre P, Nygaard S, Derkach VA, et al

Patients frequently use food rituals to manage internal chaos, reduce uncertainty, or regain a sense of continuity during mood fluctuations [85]

Metformin protects against doxorubicin-induced cardiotoxicity: involvement of the adiponectin cardiac system

The fourth line of defense is the adaptation (cellular signalling antioxidant defense) system

Conventional treatments (compression, sclerotherapy, ablation, surgery) manage hemodynamic dysfunction by reducing venous reflux or removing damaged veins entirely they dont restore vein wall collagen, repair endothelial damage, or reverse the cellular pathology that caused varicose veins