Oral B12 has only about 1 to 2 percent absorption, while injections are absorbed at 55 to 97 percent
*Methylcobalamin (Vitamin B12) is also indicated in those with pernicious anemia, diabetes, neuropathy, heart disease, circadian rhythm sleep disorders, memory loss, depression, fatigue, AIDS, inflammatory bowel disease (IBD), Lyme disease, osteoporosis, tendonitis, psychiatric disorders, Alzheimers disease, liver and kidney disease, and asthma
Always good to have a reason I have also had this happen when my folate was low , it may be worth you getting it checked I had self inject my B12 every 4 weeks for the last 20+ (cannot really remember how long accurately), and 2 months ago got a similar 'electric shock tingling' all over my body - head, face, arms, hands, legs, feet etc within a couple of minutes of injecting, which lasted about 3 seconds or so
Table 4: Semax nasal spray reported side effects and management guidance This table reflects reports from published research and clinical use
These situations warrant pausing: Severe, persistent vomiting that prevents adequate hydration for more than 48 hours
While copper allergy appears rare, patch testing could be prudent for patients with a history of metal sensitivity or atopic dermatitis