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The two research-favored windows are pre-bed (stacking onto the natural overnight GH surge) and fasted morning
In fact, a 2019 study found that sublingual B12 supplements (a form of supplement that you place under your tongue and let dissolve) were more effective than B12 shots for increasing B12 levels
10.1016/S0092-8674(02)00722-5 Cell 68 PatelS
The body makes glutathione naturally, but it is also widely sold as an antioxidant supplement
References Forman, H
That literature and its limits are covered on the GHK-Cu product page
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