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In those cases, there isnt really a guarantee of purity, she says

It is always recommended by doctors to include GHK-cu in a shampoo after hair transplant

Not my rear

It can rule out B-12 as a significant contributing factor and allow your care team to explore other causes of your symptoms, such as depression or another underlying condition

The Overstated Mechanism If you have been reading about copper peptides for hair, you have probably encountered claims that GHK-Cu "inhibits DHT" or "blocks 5-alpha reductase" (the enzyme that converts testosterone to dihydrotestosterone, the hormone responsible for pattern hair loss)