can b12 injections cause dizziness Are Vitamin Shots Right for You? What Causes B12 Side Effects?

In theory, combining agents that both reduce adiposity and improve insulin sensitivity could produce additive or synergistic metabolic effects but this is entirely speculative and unproven in humans

Niacin/niacinamide may potentiate the effects of antihypertensive medications by causing additional vasodilation

Clinicians may monitor complete blood counts, vitamin B12 levels, methylmalonic acid, homocysteine, potassium, or other markers depending on the situation

Keep in mind that oral B is not well absorbed in people who truly lack intrinsic factor or have certain GI issues, which is why B is usually injected or given as a high-dose sublingual in those cases