Pinnell SR, Yang H, Omar M, Riviere NM, DeBuys HV, Walker LC et al (2001) Topical L-ascorbic acid: percutaneous absorption studies
Why is Vitamin B12 Injection preferred over Oral supplementation
Other than patients who have had their stomachs bypassed, there is also an autoimmune condition known as pernicious anemia that leads to a deficiency of intrinsic factor, lack of ability to absorb vitamin B12 and therefore poor availability of cobalamin (vitamin B12)
Its important to know how a treatment works over the short course of a trial, but youd like to be able to extrapolate those effects over the long-term (a good example is an internal defibrillator for the prevention of sudden death)
They cost roughly $0.10 each, not worth the risk of saving 10 cents
Analysts estimate sales of the drugs to reach $150 billion by the early 2030s