Ephedrine is a sympathomimetic that is extracted from the plant Ephedra. Ephedrine belongs to the group of beta-2-blockers and can be used to reduce body fat during a diet as well as to gain intensity during training and to increase mental abilities. Ephedrine is naturally found in Ephedra herb and some other plants such as Sida Cordifolia and Ma Huang.
Ephedrine is the strongest supplement in bodybuilding as it can burn fat like no other and increase work out intensity. Those who do not exercise will experience a fat reduction with ephedrine without diet or training, because ephedrine among other things slightly increases body temperature and therefore calories and fat burn without exercise or restriction of food intake.
The increase in body temperature is caused by a strong release of adrenaline. This adrenaline-dispersing effect is also known from the caffeine in coffee, for example. One feels fit and awake and feels an increased urge to move as well as an inner warmth. Ephedrine in particular produces a very strong release of adrenaline, which raises the body temperature to a maximum.
The difference can be up to 1.5°C and resemble a slight fever. By the increase of the body warmth more calories are consumed than usual, the energy for this comes directly from the fat depots. This is why the claim that ephedrine burns body fat quickly and efficiently even without diet or training is correct.