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Plasma concentrations of GHK-Cu are high in youth (~200ng/mL at age 20) and decline significantly with age (~80ng/mL by age 60) a pattern that has made it a focal compound in longevity and regenerative biology research
PRECAUTIONS: Vitamin B12 deficiency that is allowed to progress for longer than 3 months may produce permanent degenerative lesions of the spinal cord
However, they rely heavily on self-reported symptoms and clinician observation (Kapur et al
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If you have a cat, they are very good at hiding any symptoms of feeling unwell so if you aren't sure if your cat is sick read this post on the signs of how to identify a sick cat and do what you can for them
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