It's a small cost to ensure sterility
B12 is essential for red blood cell production, which means regular injections can help prevent certain types of anemia and promote enhanced energy and staminaperfect for clients with busy lifestyles or demanding routines
For hair and skin, the evidence includes topical skin trials, wound studies, mouse hair-follicle data, and related copper-peptide hair follicle models rather than large, modern randomized trials for hair loss [2], [3], [6], [13]
Many people have genetic variations that make this conversion inefficient, which is why Methyl B12 is often more effective
(1997, Journal of Endocrinology) reported that IGF-1 LR3 supported protein turnover in tumor-bearing catabolic rats but also increased tumor growth in that model