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Why dosage varies by person Your B12 dosage and injection frequency should reflect your individual needs
High-dose vitamin B12 injections can cause immunologically induced skin reactions, which is why an amount adjusted to the individual blood level is recommended for supplementation among vegans to avoid possible vitamin B12 side effects
You can learn more about how our modern testing gives you reliable, lab-certified results in our guide on whether at-home blood tests are accurate
When I started to SI I got hydro
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