air bubble in b12 injection resistant design. A: sealing. B1: A trapped bubble Air Bubble in GLP-1 Syringe:
Description
There is an alternate approach to the injection, wherein you go for a 1000 mcg dose

Mol Ther Nucleic Acids (2018) 11:45567
For dial-a-dose pens like Ozempic, or single-dose autoinjectors like Wegovy, Mounjaro, and Zepbound, the delivery mechanisms are designed to administer the correct dose regardless of small air bubbles in the cartridge
a mild stinging sensation may occur due to the quinolinium structure

In the case of longevity, mice die mostly from cancer, whereas humans die mostly from cardiovascular disease and cancer