What makes IV Vitamin Therapy unique compared to oral supplements?

A vitamin you swallow and a vitamin put into a vein are sometimes sold as the same idea. The route is what changes your safety questions.
Swallowed or by vein: the difference that counts
A supplement goes in by mouth. IV Vitamin Therapy goes in through a needle and a line, placed by someone trained to do it. That difference is why the safety questions differ too. What either route does in your body is for the licensed person treating you to explain, along with the evidence they rely on.
Questions a line in the arm raises
Ask who answers for what goes into the bag and who watches you while the line is in. At the visit, ask which signs during or after the infusion they want to hear about, and which mean calling emergency services.
If you are weighing the infusion against a pill
If you want a hospital's overview of IV vitamin therapy, read the hospital expert-advice article on IV vitamin therapy. If you want to see how an infusion is tolerated in practice, read the PMC retrospective pilot study of how IV NAD+ and IV nicotinamide riboside were tolerated next to it.
If the pill you are considering is NAD+, read the Cleveland Clinic article on NAD+ supplements, their benefits and risks. Whether you need a vitamin at all is a separate question. If you suspect a shortfall, read the Cleveland Clinic overview of vitamin deficiency types, symptoms, and diagnosis and then raise it with a physician.
Choosing a route in Long Island City
If you live in Long Island City or elsewhere in the city and are torn between a bottle and an infusion, ask who will give it, what is in it, and who to phone if you react.
Matching the route to your history
Choose the route together with a licensed physician who has reviewed your records.