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Both of these contain the L-glutathione form, which has been clinically studied, demonstrating an increase in blood glutathione levels and support of the immune system

[DOI] [PMC free article] [PubMed] [Google Scholar] Tobin M.K., Musaraca K., Disouky A., Shetti A., Bheri A., Honer W.G., Kim N., Dawe R.J., Bennett D.A., Arfanakis K

This hyperpolarization inhibits calcium ion influx, reduces actin-myosin sliding, and induces relaxation of corporal smooth muscle cells (CCSMCs), contributing to penile erection

Dose Range: 250 mcg (0.25 mg) to 2400 mcg (2.4 mg) weekly with stepwise titration every 4 weeks to improve tolerability