Most medical documents indicate you might experience any of these: Mild diarrhea and/or upset stomach Difficulty breathing or swallowing Weight loss or weight gain Nervousness or restlessness Nausea or vomiting Headaches or migraines Paresthesias (tingling sensations) Rhinitis (chronic sneezing or a congested, drippy nose) Skin reactions, such as rash, itching, swelling, blisters, or pain at the site of injection Light joint pain Lightheadedness or dizziness Chest pain or discomfort Low blood potassium levels Irregular heartbeat Chills, night sweats, fever, or hot flushes General feeling of sickness However, people often fail to recognize that many side effects of vitamin B12 injections are consistent with B12 deficiency itself
Some patients report noticeable cosmetic changes after 2 to 4 months of consistent use
The formulation improves on first-generation chemistry with better mechanical properties and a 20% increase in print speed
ACS Sustain Chem Eng 7(5):45644585 Yang X, Ng W, Wong BSE, Baeg GH, Wang C-H, Ok YS (2019b) Characterization and ecotoxicological investigation of biochar produced via slow pyrolysis: effect of feedstock composition and pyrolysis conditions
But some will notice side effects, minor or annoying, yet not dangerous
Instead, gently swirl or roll the vial between your palms