To achieve blood levels of at least 30 ng/mL, adults living at temperate latitudes (think: anywhere with distinct seasons) need 800 to 1,000 IU per day, ideally from vitamin D3, which is more effective than D2
The effects of dietary supplement with collagen and vitamin C and their combination with hyaluronic acid on skin density, texture and other parameters: a randomized, double-blind, placebo-controlled trial
If you are concerned about the possible connection, however, opt for a shot that contains other B vitamins instead, such as vitamin B6
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How Does GHK-Cu Work
That is double your starting dose, which may trigger significant gastrointestinal side effects including nausea, vomiting, and diarrhea