You may be at higher risk if you: Follow a vegan or vegetarian diet Eat very little meat, fish, eggs, or dairy Are over the age of 50 Have digestive conditions affecting absorption Take certain medications, such as metformin or acid-reducing medicines Have had certain stomach or bowel surgery Have pernicious anaemia or absorption problems People in higher-risk groups may benefit from advice, testing, or treatment depending on their symptoms and medical history
Certificate of Analysis with lot number, HPLC chromatogram, mass-spec confirmation, and endotoxin reading
Vaughn AR, Branum A, Sivamani RK
For first-time users, an 8-week cycle provides an excellent introduction
however, significant defects occur