In the US military, medical personnel prescribed motrin (ibuprofen) frequently and in large doses for any number of injuries or ailments. In the late 1980's and early 1990's before the generic version became available it was so popular that it accounted for almost 50% of military pharmacy prescriptions. The drug was coined the name "Vitamin M" due to its high number of prescriptions for US soldiers, sailors, airmen and marines.

The process of searching a building for an empty bathroom. A successful bowl search typically relieves the frustration of uncomftorably defecating around others, although in less frequent cases the desire to urinate alone is a factor. Bowl searching can be done anywhere although it is most prevelant on college campuses.

Vitamin M is Money, Recommended daily allowances are measured in $.
Liquid Vitamin M would be cash on hand.

Although literally it is Folic Acid, Vitamin M refers to Marijuana. See also: Vitamin THC

Slang expression for the Maker's Mark Manhattan, the whiskey-based cocktail, which in this case, is specifically made with Maker's Mark bourbon. For some people the Maker's Mark Manhattan has the effect of stimulating lively conversation and artistic creativity; thus, it is considered to have a beneficial effect on the body and the mind in the tradition of a good vitamin.

A slang for mercury (Hg) which has been found as accidental contamination of certain vaccines. Widely used in Alex Jones lexicon

A nutritional supplement administered to Joe from Mike.