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You should never attempt to determine your own dosage
Incidentally, the healthy reference range is 191-663 pg/ml and correlates closely with oral cobalamin intake, which is why the vitamin B12 blood level alone is not an adequate parameter to diagnose a deficiency (Herrmann and Obeid, 2014)
In September 2023, FDA placed "Thymosin Beta-4, Fragment (LKKTETQ)," the substance sold as TB-500, on Category 2 of its interim 503A bulk drug substances list, meaning FDA identified significant safety concerns and would not permit licensed compounding pharmacies to use it
2 Thymosin Beta-4 Cardiac Repair Bock-Marquette et al., Nature (2004) This foundational paper demonstrated that the G-actin-sequestering peptide T4 promotes myocardial and endothelial cell migration in the embryonic heart and retains this property in postnatal cardiomyocytes
