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If your body doesnt have normal B12 levels, you might have a deficiency and should contact your healthcare team

trouble swallowing

Medication Requirements: Patients who regularly use NSAID medications, such as ibuprofen, are often better candidates for gastric sleeve because NSAID use after gastric bypass increases the risk of ulcers

Your doctor might recommend a vitamin D test if you exhibit symptoms or have risk factors for deficiency: Symptoms: Chronic fatigue, bone pain, muscle weakness, frequent infections, depression, hair loss

If youve made it here then it should be obvious that using B12 in any low thyroid state is probably a great idea