Most people start weekly, then transition to monthly maintenance once levels stabilize
Also, cystatin C has been shown to be predictive of heart failure development, and increased levels have been associated with increased mortality in both acute and chronic heart failure (Lassus 2012)
Ratio of serum proBDNF to BDNF and its association with cognitive performance and brain morphometry in mild cognitive impairment
(PubMed) Desmond MA, Sobiecki JG, Jaworski M, et al
If you have reached your 40s or 50s and noticed your skin becoming thinner, more reactive, or prone to "retinol burn," choosing the right approach is the difference between a healthy glow and a compromised barrier
Unless the argument is that those people can access their B12 stores and you cannot, but I don't think we can assume that