Possible Thyroid Tumors (Including Cancer) Tell your healthcare provider if you get a lump or swelling in your neck, hoarseness, trouble swallowing, or shortness of breath
In rare cases, people may experience allergic reactions to vitamin B12 supplements or injections
For older adults, the vitamin B12 injection dosage for adults might need to be adjusted
When a compound has no completed human trial, there is by definition no safety data in any subgroup no pregnancy data, no hepatic-impairment data, no interaction data with common metabolic or endocrine medications
Where Phase I or Phase II human trials exist, they are noted in the compound page summary
People on blood thinners bruise more easily and should mention it beforehand