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(2) in the high-stability reduced glutathione for injection muscle single-administration irritation test, the rabbit biceps femoris control group, the market-sold group and the tested group have no red swelling, congestion and degenerative necrosis phenomena, and have no pathological damage, which indicates that the high-stability reduced glutathione for injection (the batch number is YJ110401) has no irritation reaction on the rabbit biceps femoris by intramuscular single injection

Hepatology 11 , 916922, (1990)

Although NACs ability to restore intracellular GSH and modulate ferroptotic markers remains mechanistically relevant, its limited benefit in clinical practice suggests a need to prioritize more targeted and potent antioxidants in future therapeutic design

It says safe for pregnancy are those safe for nursing as well

What can affect your glutathione

Nievola CC, Carvalho CP, Carvalho V, Rodrigues E (2017) Rapid responses of plants to temperature changes