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Published research on GHK-Cu and Acetyl Tetrapeptide-3 has looked at scalp health and the appearance of hair density
A 2023 PMC review supports this, noting that glutathione and vitamin C have a reciprocal role in regulating oxidative stress and immune readiness
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A 2024 study in NeuroImage found a strong link between higher glutathione levels and better visuospatial memory, a cognitive skill you need for tasks like navigation
The answer depends on your desired final concentration
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