Injections cost more per dose because there is a charge for the medical service and the pharmaceutical-grade vitamin, but more of what you pay for is actually absorbed
How to Prepare for a Safe B12 Injection Getting ready for your B12 injection is all about setting yourself up for a smooth, comfortable, and safe experience

When three or more vaccines are performed during the same visit, apply additional units to the subsequent administration code for each additional vaccine of the same route (injection or oral/nasal.) Here are some examples of multiple vaccination administrations: Example 1: 3 intramuscular injections 90471 x 1 unit for the initial intramuscular vaccination administration +90472 x 2 units for each additional intramuscular vaccination administration Example 2: 1 intramuscular injection and 1 oral administration 90471 x 1 unit for the initial intramuscular vaccination administration +90474 x 1 unit for the additional oral administration Example 3: 2 intramuscular injections, 1 oral administration, and 1 nasal administration 90471 x 1 unit for the initial intramuscular vaccination administration +90472 x 1 unit for the additional intramuscular administration +90474 x 2 units for the additional oral/nasal administrations Example 4: 1 oral administration and 1 nasal administration 90473 x 1 unit for the initial oral/nasal administration +90474 x 1 unit for the additional oral/nasal administration Vaccine Administration with Counseling Next, lets look at vaccine administration when counseling is provided and billed with 90460 or +90461

This area has plenty of muscle, which is exactly what you want for effective absorption and a comfortable experience
If your B12 deficiency is due to an autoimmune disease or something that's not related to diet, you may need to get injections every two or three months for the rest of your life