Caffeine is a stimulant that is used to stay awake and it gives mental alertness from fatigue. This is used as an adjunct for pain relief and also as energy accelerates. Caffeine is a non-prescription drug easily available as over the counter medication and comes in combination to acquire relief from headache and pain. Caffeine increases the mental alertness by offering the required energy for exercise training and weight loss. Caffeine cannot be considered as a mere stimulant as it reaches deep into muscles and provides power that is long lasting. Caffeine taken before any work out is also great as it fights the fatigue and keeps the person ready for the workout. Dieters also find caffeine as the solution as they feel sluggish. This is a no-calorie stimulant and does its job effectively and quickly. Caffeine anhydrous is found even in one or two coffee cups. However, this limitation is recommended as excess caffeine may result in irritability, rapid heart beat, nervousness and sleeplessness.

Camellia Sisensis .

Capsaicin is used in several skin preparations and is used to relieve pain. It is available in the market in various forms such as ointments, creams, gels, liquids, lotions, sticks and pads under marketing names such as Capsagel, Zostrix, Arthricare for Women and Icy Hot Arthritis Treatment. A very astonishing fact is that capsaicin happens to be the active part of chili peppers. Though it is an irritant producing burning sensation on any tissue that comes in contact with it, it depletes substance P. Substance P transmits impulses of pan to the brain. It relieves pain due to diseases such as osteoarthritis, diabetes neuropathy and rheumatic arthritis. Capsaicin has not had any drug interactions till date. But this does not means that it can never have any interaction with any other drug. It is always best to confirm with your doctor if you really need to use capsaicin. Also, it is best to use this drug only in specified quantities.

Polyphenols.

Yohimbe is a tree that grows in different parts of Western Africa. Active compounds called alkolids are present in its bark with Yohimbine being the principal alkaloid. Yohimbe bark extracts are available in health food outlets. You can also buy it online. These extracts are promoted as a product that increases sex drive and for the treatment of erectile dysfunction. However, there is proof of their effectiveness. Most studies are concerned with the drug Yohimbine and not herbal extract Yohimbe. The side effects of Yohimbe include anxiety and dangerous increase in blood pressure.