Vitamin B12 Sprays vs Tablets : What's the Difference? Sona Quick question why do people talk about B12 injections versus ingestible pills? I wish I injections. I do not have the cash for that little backstory. I've been eating vegan style for Vitamin B Supplementation: Oral Capsules vs. Sublingual Tablets AZ Dietitians PDF) Comparison of sublingual vs. intramuscular administration of vitamin B12 for the treatment of patients with vitamin B12 deficiency