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That literature and its limits are covered on the GHK-Cu product page

If your concentration is 2mg/mL (2000mcg/mL), a 250mcg dose requires 0.125mL

Hsieh, M., Lee, C., Chueh, H., Chang, G., Huang, H., Lin, Y., & Pang, J

While toxicity is rare, excessive intake of certain B vitamins (particularly B or B) from multiple sources could increase the risk of side effects (like niacin flush or peripheral neuropathy)

It has anti-inflammatory and anti-wrinkle properties