Build Muscle:
SUPPLEMENT: Whey Protein Powder
While preparing for Blade: Trinity, Ryan Reynolds used whey shakes to tone his six-pack.
DAILY DOSE: 20g
BEST BRAND: Solgar Whey

Reduce Stress:
SUPPLEMENT: L-Theanine
It boosts the brain's levels of alpha waves; meditation has a similar effect.
DAILY DOSE: 200mg
BEST BRAND: Source Naturals

Thicken Hair:
SUPPLEMENT: Biotin
Celebrity stylist Cristophe (past clients range from Bruce Springsteen to Bill Clinton) sells his own line of thickening shampoo that's fortified with biotin.
DAILY DOSE: 2,500mcg
BEST BRAND: Nature's Bounty

Increase Libido:
SUPPLEMENT: Korean red ginseng
Porn icon Ron Jeremy has endorsed VigRX penis-enlargement pills (which contain red ginseng), calling the results "huge."
DAILY DOSE: 1,500mg
BEST BRAND: Triverex

Lose Weight:
SUPPLEMENT: Psyllium Fiber
Fiber keeps you regular, makes you feel full, and subsequently promotes weight loss.
DAILY DOSE: 2 tbsp
BEST BRAND: Metamucil

Improve Skin:
SUPPLEMENT: Zinc Gluconate
In France, zinc gluconate is used as a prescription drug to treat acne because of its anti-inflammatory properties.
DAILY DOSE: 15mg twice a day with food
BEST BRAND: Nature Made

Cheer Up:
SUPPLEMENT: SAMe
Dr. Oz has touted the benefits of SAMe (pronounced "sammy") for treating depression by punching up neurotransmitters.
DAILY DOSE: 400mg twice a day
BEST BRAND: Nature's Sunshine

Lower Cholesterol:
SUPPLEMENT: Beta-sitosterol
The plant sterol blocks the absorption of LDL (bad cholesterol) in the gut by up to 27 percent.
DAILY DOSE: 300mg (before eating)
BEST BRAND: Baywood

Stregthen Heart:
SUPPLEMENT: CoQ10
This powerful antioxidant has been shown to reverse gum disease, which can be a predictor of heart attacks.
DAILY DOSE: 100mg
BEST BRAND: Nature Made

Sleep Better:
SUPPLEMENT: Melatonin
This hormone improves the ability to fall (and stay) asleep and promotes morning alertness.
DAILY DOSE: 2mg
BEST BRAND: Nature Made

Increase Energy:
SUPPLEMENT: L-Carnitine
Since it occurs naturally in a normal diet, it's not on the International Olympic Committee's banned-substances list, making it the athlete's supplement du jour.
DAILY DOSE: 2g
BEST BRAND: Solgar