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While absorption is slower than IV administration, it still provides significant antioxidant, anti-ageing, and skin-brightening benefits

The rationale is that their synergistic action may mean you don't need the full dose of either to achieve the desired effect, potentially reducing the total amount of compound needed

Iontophoresis: Research has explored the use of low-level electrical current to drive GHK-Cu deeper into the skin, enhancing its topical effectiveness

Use of carnitine therapy in selected cases of male factor infertility: a double-blind crossover trial

Evidence suggests benefit but needs larger trials confirming