The reliable source is the brands published pricing, which changes frequently
But, if dietary changes dont resolve the vitamin deficiency, then a doctor may recommend supplementation through pills or injections, depending on the cause of the deficiency
Trimethylamine and trimethylamine N-Oxide, a flavin-containing monooxygenase 3 (FMO3)-Mediated host-microbiome metabolic axis implicated in health and disease
For deeper detail on any individual compound, including mechanism of action, full side effect profile, or clinical trial data, follow the link to that compound's individual protocol page
Improvements in access will take time, and require generation of compelling data (e.g., pharmacoeconomics, impact on comorbidities) and savvy commercial strategy