does b12 methylcobalamin injection Vitamin B-12 - Mobile and Clinic IV Therapy — ASAP IVs B12 (Methylcobalamin) Ampules – 10

Any necessary preparation and recovery instructions will also be provided, as well as a written quote

However, research performed by doctors explains that when people can properly absorb and store vitamin B12, it is stored within the body for between 3 to 5 years

Sorry if that's not what you were hoping for, but as you say, it seems to be the most stubborn symptom for sure

Prostaglandin E1 plus methylcobalamin combination therapy versus prostaglandin E1 monotherapy for patients with diabetic peripheral neuropathy: a meta-analysis of randomized controlled trials

Journal of Endocrinology and Metabolism, 3(12), 715

Zhuravliova, E