B12 is available in different forms, including tablets, liquid, nasal spray, and injections. The oral forms are available over the counter without a prescription.
B12 comes in a low-cost generic form.
Taking B12 can prevent and treat B12 deficiency, which is associated with nerve damage.
B12 nasal gel and injection are by prescription only.
The oral form of B12 has low bioavailability (does not absorb well) and may not be effective in treating severe B12 deficiency.
High doses of B12 can cause problems like low potassium and high platelet count.
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