Side Effects & Safety No lethal dose found -- toxicology studies couldn't establish an LD50 (Sikiric et al., 2006) No organ toxicity in chronic dosing No hormonal effects -- doesn't affect testosterone, estrogen, cortisol, or GH Mild nausea -- mostly with oral dosing Brief lightheadedness -- occasionally after injection Injection site redness -- standard for SC peptides Angiogenesis concern -- promotes new blood vessel growth, which raises a theoretical question about existing tumors

While often temporary, this increase in platelets carries serious risks: Deep vein thrombosis (blood clots in deep veins, usually in legs) Pulmonary embolism (blood clots in lungs) Arterial thrombosis (clots in arteries) Cerebrovascular events (strokes) Coronary artery thrombosis (heart attacks) Splanchnic vein thrombosis (clots in abdominal veins) The risk is particularly high in: Elderly patients Those with pre-existing heart disease Patients with inherited blood-clotting disorders Immobilized individuals Those with hardened arteries Neurological Symptoms and Joint Pain Paradoxically, B12 replacement can temporarily worsen or trigger new neurological symptoms
Cobalamin is an essential cofactor in red blood cell synthesis
Let's look at what some of these side effect reactions etc that people have from taking B12
Lower doses use more water to enlarge the draw, as the table lists
In animal and cell models, it supports gut lining repair , tendon and ligament healing , new blood vessel formation , neuroprotection , and balanced nitric-oxide signalling