The only reliable way to determine whether you have a vitamin B12 deficiency is through blood testing ordered by a qualified healthcare provider
Some research suggests that vitamin B12 may have specific benefits for endurance athletes, such as: Improved performance: Some studies have found that vitamin B12 supplements can improve exercise performance in athletes, particularly when taken in combination with other B-vitamins
The difference here is that B12 analogues are not bioavailable and so wont improve your B12 intake
The combination of strong GLP-1 appetite suppression with meaningful GIP-mediated metabolic improvement creates a synergistic effect that exceeds what either receptor could produce alone, a principle similar to why peptide stacking sometimes outperforms individual compounds
(Dali-Youcef and Andrs, 2009) Other people at risk include those who have had intestinal surgeries, or have chronic conditions which affect the gut , such as Crohns disease or celiac disease (Dahele and Ghosh, 2001)
In controlled lab settings investigators have reported minimal acute toxicity during experimental protocols but researchers emphasize the importance of proper handling and safety protocols