The people who are at the highest risk of B12 insufficiency or deficiency are older adults, those with atrophic gastritis, gastrointestinal disorders, pernicious anemia, those who have had gastrointestinal surgery, vegans, and vegetarians
I have always had three rules for complementary therapies: 1
Schagen, S
Lin Z, Xiong L, Zhou J, Wang J, Li Z, Hu H, et al
Fortunately, one can order confidential tests that will not be reported to insurance, by using online lab testing services, like the Ulta Labs test for homocysteine or the Ulta Labs MTHFR gene variation test
Supplement Need: Requires concentrated forms for significant glutathione support