We offer individual and blended vitamins and amino acids. All therapies on this page can be given as intramuscular injections (IM) or administered as part of the IV therapy with the exception of Vitamin D, which must be given as an intramuscular injection (IM). Intramuscular injections are administered to the ventrogluteal or deltoid. 

Comparing the two delivery methods, vitamins and amino acids administered via an injection are absorbed more slowly than an IV and therefore stay in your system longer. Conversely, those administered through an IV are more rapidly absorbed and the benefits are more immediate.

Vitamin Overview
Vitamins are organic molecules that are necessary for the proper functioning of an organism. Vitamins can either be essential or non-essential. Non-essential vitamins -- vitamin D and vitamin B7 (biotin) -- can be synthesized by the human body. On the other hand, essential vitamins cannot be synthesized and must be obtained from an external source such as diet, oral supplementation, intravenous (IV) therapy, or intramuscular injections.

• Fat-soluble vitamins are stored in the body's liver, fatty tissue, and muscles. The four fat-soluble vitamins are vitamins A, D, E, and K.
• Water-soluble vitamins are not stored in the body. The nine water-soluble vitamins are vitamin C and all the B vitamins. Any leftover or excess amounts of these leave the body through the urine. They have to be consumed on a regular basis to prevent shortages or deficiencies in the body.

Source(s): MedlinePlus and National Institute of Health