oral vs injection b12 Frontiers Oral vs. Intramuscular Vitamin B12

[3] Healthcare providers may also exercise caution when prescribing these medications to individuals with kidney disease or a history of suicidal ideation or behavior

The medication disrupts nutrient absorption through multiple mechanisms, including blocking gut uptake and altering metabolic pathways

No, folic acid does not mess with your hormones

However, several reports highlight that while generally safe, these injections can sometimes cause adverse effects, most notably hypersensitivity and anaphylactic reactions

Over a few weeks in Nov-Dec 2017 I manifested symptoms of fatigue, weakness, severe night sweats, erratic high and low blood pressure, headaches and chest pain (one time so bad I went to the ER thinking I was having a heart attack)