b12 injection how long before it works Injections: Who Should Get Them and Do They Last? Sublingual B12 vs. B12 Injections:

STEP 3 Track progress, check in with your provider, and access 24/7 support to keep your results on track

While oral supplements can be helpful, they have to pass through your entire digestive system, where absorption can be unpredictable

Long-term vitamin B12 deficiency of greater than 3 months may result in irreversible degenerative lesions of the spinal cord (CNS)

Concurrent nutritional deficienciesparticularly folate or iron deficiencycan impair the response to B12 treatment, as these nutrients work together in red blood cell production

Individuals with Pernicious Anemia: This condition affects the ability to absorb B12, often requiring lifelong supplementation