Caffeine- The bitter, white crystalline xanthine alkaloid caffeine is found in tea, coffee, soft drinks, chocolates, pain relievers, and a variety of over the counter medications. It is a psychoactive stimulant drug that causes increased alertness by stimulating the central nervous system. For the same reason, many people feel more energetic after consuming it. It even elevates the mood but these effects do not last for long. The effects of caffeine usually last for about five to six hours, though caffeine sensitivity varies from person to person. It has been found that people who consume lot of caffeine on a daily basis soon develop less sensitivity and may need to increase their intake to enjoy the same effect. Being a diuretic, a person consuming caffeine may have to urinate more often.

Ginger Root refers to the rhizome of a plant called zingiber officinale that grows in moist and fertile tropical soil. Ginger is an underground stem extending to 12 inches above the ground. The ginger root has pungent phenol compounds and volatile oils. This is widely used as a medicine in Indian, Asian and Arabic herbal traditions. Ginger, in China is used to cure stomach upset, nausea and diarrhea since ancient times. Ginger is of great use to cure arthritis, diarrhea, Colic and heart conditions. Besides the medicinal value, Ginger is one of the indispensable ingredients as cooking spice and is also recommended to cure headaches, common cold, symptoms like flu and also painful menstrual periods. Ginger is widely used as medicine as it treats nausea, vomiting related to travel sickness, cancer chemotherapy and pregnancy. Though, there are effective medicines today, ginger root retain its position for its medicinal properties. It is also beneficial for heart disease as it reduces cholesterol and averts blood clotting. The ginger products are manufactured using dried or fresh ginger root and these are obtainable in extracts, capsules, tinctures and oils. Ginger is used in tea and in various drinks and foods.

Green Tea Extract is very popular with the health conscious community, mainly because of the broad antioxidant features, which are provided by the green tea catechins. It is a very popular nutritional supplement, much more popular than regular green tea, because several green tea extract products have no caffeine. Caffeine is actually contained in larger quantities in green tea than in coffee. Besides the already mentioned catechins, further polyphenols are included in the Asian tea favorite. Green tea furthermore contains carotenoids, ascorbic acid – more commonly known as Vitamin C, Minerals and tocopherols. While there are many proven qualities of green tea extracts, some lesser researched effects have been observed, like reduction of LDL cholesterol, increasing the levels of norepinephrine, weight loss and additional antioxidant qualities.

Guarana- The active constituent of guarana is caffeine, which means that it should not be used alongside ephedrine as either a dietary aid or in order to stimulate performance. The American Food and Drug Administration has not tested its effectiveness or its purity as they do not class it as a drug. Guarana has many other names including Brazilian cocoa and may be a constituent of non alcoholic drinks imported from South America. Because of possible adverse reactions it is not recommended for anyone with a heart condition or who has kidney disease, high blood pressure or who suffers from anxiety.

Kola Nut is native to Africa, mainly found in the tropical rain forests. There are about hundred and twenty tree species which belong to this family, their fruit, the kola nut, being the interesting feature. It has been traditionally used for chewing, with an effect where hunger cravings subsided. The popularity of the kola nut was established by The Coca-Cola Company, which used the kola nut as an ingredient in this popular drink. Many other similar drinks and also energy drinks feature this ingredient. The kola nut, although featuring caffeine, provides a xanthine mixture with catechins which not only stimulate the central nervous system but also has analeptic and lipolytic properties, as well as chronotropic effects. Further effects include enhanced alertness, physical energy, mood and tactile sensitivity, as well as appetite suppression.

Some Unknown Ingredients, which is a common practice for many supplement manufacturers. They use ineffective common ingredients and trademark their name for them to disguse the actual low quality ingredient contained.

Yerba Matte Pronounced, YARE-ba MAH-tay, yerba mate is a shrub that belongs to the holly family. A Key Element in Estrin-D Yerba mate contains the following vitamins, minerals and additional compounds: Vitamin A to Vitamin C Vitamin E Vitamin B1 Vitamin B2 Vitamin Niacin Vitamin B5 Vitamin B complex Minerals: Calcium Iron Manganese Magnesium Potassium Phosphorus Selenium Additional Compunds: Flavonols Polyphenols Antioxidants Pantothenic Acid and more The leaves of yerba mate have been found to offer strength while the stems inspire energy.