Scientific Reports (2020) 4
This is why verification matters more than the calculation itself
For reconstituted peptide, freezing is contraindicated entirely
While oral B12 supplements are available, vitamin B12 injections have advantages including enhanced absorption since it bypasses digestion, a fast-acting energy boost from quick absorption, higher blood levels reached versus pills, lasting benefits between maintenance doses, improved concentration and mental clarity, and often more affordable and convenient long-term
Even in high-dose supplements, the maximum acceptable level of prussic acid set by EFSA is not reached

Potential risks Serious risks and adverse events include: Allergic reaction to the medications or dye used in the injection Shoulder infection Depigmentation of the skin around the injection site (a whitening of the skin) Local fat atrophy around the injection site (thinning of the skin) Rupture of a tendon located in the path of the injection Nerve damage near the shoulder joint Bleeding at the injection site In addition to the above, corticosteroid injections increase the risk of: High blood pressure High blood sugar Decreased immune function Decrease in bone mineral density Bone infection (osteonecrosis) Reproductive hormone imbalance Metabolic changes (eg, increased appetite, weight gain, and fluid retention) These risks are typically associated with higher doses of corticosteroids, multiple injections, and for people with underlying medical conditions such as diabetes and heart problems