High-Risk Profiles The threshold for testing should be lower if the individual falls into any of these categories: Age 60 or older Long-term use of metformin or proton pump inhibitors (PPIs) Strict vegetarian or vegan diet Family history of pernicious anemia or autoimmune disease Key Clinical Symptoms Neurological and cognitive: tingling, numbness, or a "pins and needles" sensation in the hands or feet
Animal absorption does not establish human bioavailability, effectiveness or safety
The trace mineral is essential for the microorganisms to manufacture and utilize Vitamin B12
Vitamin B12 is found primarily in animal-source foods including meat, fish, dairy products, and eggs
Animal-to-human amount translation is not straightforward and requires allometric scaling, and human pharmacokinetics, safety, and efficacy remain uncharacterized in published literature
Additional weight loss of 5-15% of current body weight has been reported in these studies, though results vary considerably and most studies have limited follow-up duration
