Other exclusions may apply

Medicare Part B covers the following preventive services at $0 cost to you in 2026 meaning no deductible and no coinsurance: Annual wellness visit with your doctor Welcome to Medicare preventive visit during your first year Abdominal aortic aneurysm screening one-time for those at risk Alcohol misuse screening and counseling Blood pressure screening Bone density test for osteoporosis Cardiovascular disease screening cholesterol, lipid, and triglyceride tests Colorectal cancer screening colonoscopy, sigmoidoscopy, stool tests Depression screening once per year Diabetes screening up to 2 screenings per year for at-risk patients Diabetes self-management training Glaucoma tests once per year for high-risk patients HIV screening Lung cancer screening with low-dose CT scan annually for eligible patients Mammograms once every 12 months for women 40 and older Obesity screening and counseling Prostate cancer screening digital rectal exam and PSA test once per year Sexually transmitted infections screening and counseling Tobacco use cessation counseling Vaccines flu shot, pneumonia vaccine, Hepatitis B vaccine, COVID-19 vaccine What Medicare covers in 2026 for preventive services is comprehensive

Compared to pills or capsules, liquid B12 is absorbed faster and more efficiently by the body, so you start feeling the benefits sooner
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The answer is not straightforward
B12 injections can interact with several commonly prescribed medications