start training smarter, all the drugs and herbs and vitamins in the world won't make you faster, but they could give you cancer. Your body isn't a car that you dump NOS down your intake and increase your wattage output by 100 watts! The human body responds to proper training and that can increase your wattage by 100 watts.
Why didn't you read about the side effects of anything you were thinking about taking before you ran out and bought it or took someone's word about it?
Rhodiola Rosea causes Insomnia, Irritability, Mild Jitters or Shakes, Restlessness, Vivid Dreams, Anxiety, Heart palpitations, Panicked Feeling (not quite a panic attack), Rapid Heart Beat.
DHEA causes acne, hair loss, stomach upset, and high blood pressure. Some women can have changes in menstrual cycle, facial hair growth, and a deeper voice; when used in larger amounts and long-term. Do not use DHEA in doses higher than 50-100 mg a day or for a long period of time; DHEA is a hormone that can affect how estrogen works in the body. If you have any condition that might be made worse by exposure to estrogen, don’t use DHEA. Liver problems: DHEA might make liver problems worse. Don’t use DHEA if you have liver problems. Diabetes: DHEA can affect how insulin works in the body. If you have diabetes, monitor your blood sugar carefully if you are taking DHEA. Depression and mood disorders: There is some concern that patients with a history of depression and bipolar disorder might have some mental side effects if they use DHEA. DHEA can cause mania (excitability and impulsiveness), irritability, and sexual inappropriateness in people with mood disorders. If you have a mood disorder, be sure to discuss DHEA with your healthcare provider before you start taking it. Also, pay attention to any changes in how you feel. Polycystic ovary syndrome (PCOS): Taking DHEA might make this condition worse. Don’t use DHEA if you have PCOS. Cholesterol problems: DHEA might lower “good cholesterol” (high lipoprotein cholesterol, HDL). If your HDL level is already too low, discuss DHEA with your healthcare provider before you start taking it.
Most of the stuff in health food stores is crap and can be very dangerous especially the longer you use a lot of it. There is no federal regulations over the garbage health food stores can sell you so you have no ideal it their safe, and most of time their not.
I don't take any multi-vitamins or other supplements and I never did in 40 odd years of riding and racing. All I need I get from food and exercise, and so can you if you eat right and train right, so save yourself some money and start doing things smarter.