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An iron deficiency can begin with dizziness, general fatigue, feeling light-headed, a rapid heart rate or palpitations, brittle nails, and more

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Reported benefits (per available research): Studied for its ability to raise GH and IGF-1 toward youthful levels and blunt age-related loss of fat-free mass, based on a 2-year randomized, placebo-controlled trial in 65 healthy older adults (Nass et al., 2008, Annals of Internal Medicine, PMID 18981485)

It also provides a protective antioxidant effect for nerve cells, limiting and preventing damage from unstable cells called oxidants

GHK-Cu addresses each of these issues through specific biological mechanisms