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That said, deficiency is rare and can only be confirmed through a lab test
Association between metformin and vitamin B12 deficiency in patients with type 2 diabetes: A systematic review and meta-analysis
While more severe forms are not all that common, some research estimates that MCAS could affect up to 17% of the population on a spectrum from very mild to debilitating symptoms.[ref] Others include very mild symptoms such as allergic rhinitis in the mast cell activation spectrum, which includes up to 30% of the population.[ref]
You can learn more about AHK-Cu vs GHK-Cu in our blog
Community subcutaneous research plans often reference 300-500 mcg per day
