But here are some broad pointers: Most adults and kids can use 4 mm or 5 mm needles without any problems
Prioritize GHK-Cu if: You're primarily concerned with visible wrinkles, skin laxity, photodamage, post-procedure recovery, or compromised barrier function
BSCG tests every finished product lot for over 450 substances, including more than 400 WADA Prohibited Substances and 50 prescription, over-the-counter, or illicit drugs not specifically banned in sport
The research literature supports 28 days as the conservative recommendation with a reasonable safety margin
Many women choose to use a GHK-Cu serum in the morning (under your daily moisturizer with broad-spectrum sun protection) and then use a retinol or vitamin C at night to avoid the sun sensitivity that can be caused by retinols
Their combined angiogenic effects are key to improved oxygenation and nutrient delivery during tissue recovery