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The timeframe for B12 levels to increase following supplementation varies considerably depending on the severity of deficiency, route of administration, dosage, and individual absorption capacity

The two esters have different pharmacokinetic profiles: testosterone propionate is a short-chain ester that reaches peak levels quickly but has a relatively short elimination half-life (on the order of 1-2 days), necessitating more frequent dosing (e.g., every 2-3 days) to maintain stable levels

Further evidence of that link can be found in a 2015 study published in the journal Science Translational Medicine

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