When any of those slips, the result is usually minor and short-lived, but it is worth understanding what can actually go wrong, and why we think this is a job for a clinician rather than a kitchen-table DIY
The NHS advises that taking up to 2 mg (2000 micrograms) daily is unlikely to cause harm in healthy individuals
Grace Ramosena, MBChB on Jan 25, 2026 Use this hCG calculator with at least 2 beta-hCG blood test results to estimate doubling time or halving time, compare your rise with typical early-pregnancy ranges, and view a chart
Do not exceed the recommended dosage
A must-stop for any Peru adventure tour from Lima
If your B12 deficiency is severe, it could take 4-6 weeks of injections before you really start to turn the corner and feel like your old self again