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1.
A newly discovered vitamin, only found in malk.
Oh, my bones are so brittle. But I always drink plenty of..."malk"?

Vitamin R does not help with bone health.
by Thar be dargons September 04, 2012
 
2.
ritalin, specifically when used by a college student without adhd to complete a large assignment.
sarah i just got to get me some vitamin r to finish that 20 page history paper. hook me up.
by kayla January 22, 2004
 
3.
Rainier Beer.

Popular in the Pacific Northwest, Rainier Beer is a brand of beer that features an iconic script "R" prominently on the can.

Although Rainier is now owned by Pabst brewing and is bottled in California, lots of people in the Pacific Northwest still prefer Rainier as the 'local cheap beer,' as it is most certainly a cheap "macrobrew" not a "microbrew."
"We drink lots of Vitamin R when we go fishing up near Seattle."

OR

"Why do you like Rainier Beer so much?"
"Because I grew up stealing cans of Vitamin R out of my dad's fridge. It's always been my favorite cheap brew."
by KBLI October 07, 2009
 
4.
A slang term for the stimulant drug methylphenidate (sold as ritalin,concerta,focalin ect).

Vitamin R is derived from amphetamine and is the closet pharmalogical equivalent of cocaine.

It is used as both a study aid and a recreational drug. When used recreationally it is typically snorted, with doses ranging from 20-40mgs, Although it is much more addictive when taken this way.
Bill:hey, You up for tonight?

Bob: fuck yeah! Is mad P gonna let us have some of his vitamin Rs?

Bill: hell yeah. Meet up his place about 8, chill for a while, get drunk. Then at 11 we'll snort 30mgs each and head out.

Bob: I'll bring a spliff for the come-down.

Bill: Cool. Remember, no booze after the vitamin R. Just because you're no longer intoxicated doesn't mean you're no longer drunk.

Bob; Agreed.
by Dr.Feelgood2 July 31, 2009
 
5.
Is basically swallowing anger or rage to the point that you can feel it in the pit of your stomach.
My ex made me take a big dose Vitamin R when she cheated on me.
by BullittTheGuardian February 16, 2009