can b12 injections make sinus problems worse Common & Rare Side Effects of Vitamin Are B12 Shots Safe? Royal
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Lluch, J

Protocol The study was conducted over an 8-week period

Well, NAD+ is a fundamental coenzyme found in every cell of your body, playing a pivotal role in countless metabolic processes, including energy production, DNA repair, and cellular signaling

If you are currently using sublingual or oral forms of B12 and you are getting symptomatic relief then I wouldnt recommend changing up your method of administration
2020 Jan 3;3(1):e1919274

They always get back to me quickly with answers to my questions