Youth is 7-keto-dhea
7-keto-DHEA is a by-product of dehydroepiandrosterone (DHEA), a chemical that is formed in the body. DHEA is a "parent hormone" produced by glands near the kidneys. But unlike DHEA, 7-keto-DHEA is not converted to steroid hormones such as androgen and estrogen. Taking 7-keto-DHEA by mouth or applying it to the skin does not increase the level of steroid hormones in the blood.
People take 7-keto-DHEA to speed up the metabolism and heat production to promote weight loss. 7-keto-DHEA is also used to improve lean body mass and build muscle, increase the activity of the thyroid gland, boost the immune system, enhance memory, and slow aging.
How does it work?
7-keto-DHEA might promote weight loss by speeding up the body's metabolism.
Natural EFX also contains 7-keto, but I like to take a couple caps of Youth each day to increase the effect. If you're supp budget requires some pruning, I would suggest getting Natural EFX over Youth just because of the multitude of angles that the one product approaches fat burning.