So supplements shouldnt provide negative side effects
Vuksic T, Zoricic I, Brcic L, et al
Patients should always consult their healthcare provider before starting a new supplement, and consider requesting specific lab testssuch as a homocysteine level and a methylmalonic acid (MMA) testwhich provide a much more accurate picture of cellular B12 status than a standard serum B12 blood test
However, call your doctor if the soreness worsens or lasts more than 2-3 days
They mentioned weakness on one side, nightmares, dizziness, anxiety, insomnia, restlessness, numbness, nausea, muscle spasms, tingling, itching, acne, psoriasis, eczema, heart palpitations, leg cramps, blurred vision, hair loss, and not being able to concentrate or to stand noise
(PubMed) van Wijngaarden JP, Doets EL, Szczecinska A, et al