They can warn about side effects and interactions
Observational studies A large number of cross-sectional and prospective cohort studies have associated elevated blood homocysteine concentrations with measures of poor cognitive scores and increased risk of dementia, including Alzheimer's disease (reviewed in 67, 69)
If you dont have a vitamin B12 deficiency to begin with or you dont first address the underlying causes of a deficiency, high doses of vitamin B12 will not work to improve your quality of life
This is the point at which I realize I have no pharmaceutical training I guess There are a few people on this forum who need injections more often than every other day
Administration via injection is the most effective way to get the vitamin into your body and work as soon as possible, allowing you to experience the benefits in a matter of days
Any perceived benefits typically relate to correction of deficiency symptoms such as fatigue, which may indirectly improve capacity for physical activity