A Cochrane review supports the use of high-dose vitamin B 12 (1 mg and 2 mg daily) in elevating serum vitamin B 12 level and achieving haematological and neurological responses, even in patients with PA or with ileal resection.58 The recommendation for oral replacement is 1 mg daily for a month, and then 125 to 250 g daily as maintenance dose for patients with dietary insufficiency and food-cobalamin malabsorption, while for PA the maintenance dose is 1 mg daily.29 Vitamin B 12 does not have side-effects even when prescribed in large doses.59 However, hypokalaemia, resulting from uptake of circulating potassium by newly growing and dividing haematopoietic cells, can be severe or sometimes life-threatening
This involves: Having impressions or moulds taken of your teeth to create customised whitening trays
DSIP is available for research purposes in the USA but is not approved as a dietary supplement or medication
See what is AHK-Cu used for and GHK-Cu
In short, I still appreciate CAIS3 enough to have been repurchasing it for years and continue to use it in my routine very regularly (despite its not-so-cheap price)
NAC is necessary to maintain healthy glutathione levels, so oral supplementation makes sense