glutathione with vitamin c injection and Intravenous Vitamin C: Purpose and More Glutamax C | Toskani

HNMT uses S-adenosyl-L-methionine (SAMe) as a methyl donor to convert histamine into an inactive form

Early evidence for the potential efficacy of this route was published in 1999, where 18 patients with B12 deficiency treated exclusively with 712 days of 2 mg of sublingual cobalamin daily had 4 times higher B12 levels compared to pre-treatment, reaching therapeutic ranges ( There have also been further studies comparing treatment outcomes from the sublingual route to the more established IM and oral routes

You need to look at what happens inside the body at these doses

the results are shown in Fig

Vitamin C promotes collagen production