This delivery method serves two purposes: Protection: It shields the nutrient from the harsh environment of the digestive tract
Occasional reports include temporary fatigue or lethargy (5-10% of users), mild headaches in the first few days of use, slight water retention, or transient flushing at injection sites
it's how well your body can process and clear those compounds (aka clearance)
As of this writing, the FDA has not yet formally published the updated Category 2 list following Secretary Kennedy's February 27, 2026 announcement
(21(2)):155-64 doi:10.12809/hkmj144383
Activation of Tissue Remodeling Proteases GHK-Cu activates matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) in a balanced way that facilitates controlled extracellular matrix remodeling breaking down damaged collagen and replacing it with new, organized fibrillar collagen rather than scar tissue