I have never heard of it either, but I did find out what it is from my friend google.com
It seems it is a non-essential amino acid...
Quote:
Non-essential amino acid. Proline is associated with the production of collagen which promotes healthy skin, joints, tendons, and heart muscle. Proline helps strengthen cardiac muscle. The metabolism of proline is connected to enzymes that require niacin and vitamin C.
Ingredients:
L-proline, vegetable cellulose, vegetable magnesium stearate, vegetable glycerin, water
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you can buy it
HERE if you really want to take it, but it sounds like it is not worth wasting money on, especially since it is so unheard of.