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Megaloblastic anemia (due to B12 deficiency)

When you take a supplement, your body has to recognize it, transport it, and convert it into a form that your cells can use

Short-Term Stability : The inclusion of benzyl alcohol inhibits bacterial growth, extending the usable life of peptide solutions for short-term storage

Blood cells sticking together is what leads to a blood clot which can cause a stroke.

Consulting healthcare professionals is strongly advised to tailor supplementation to individual needs, ensuring safety and efficacy

If you've had a BAD experience with B12 shots, it's most likely that you do not tolerate or convert cyanocobalamin well (see if you can verify what form of B12 was in the shot that made you react poorly, and then stay away from that specific form if you can)