Conjugated Linoleic Acid.
Conjugated linoleic acid is a type of fatty acid found mostly in beef and dairy. It has been marketed as one of the best weight loss pills for its potential to boost metabolism and decrease appetite.
However, the majority of the studies on conjugated linoleic acid leading to weight loss have been carried out on animals. According to a review of research, weight loss appears to be minimal in human studies.
Conjugated linoleic acid appears to be safe in doses of up to 6 grams per day for up to 12 months. Possible side effects include stomach discomfort, diarrhea, or constipation, it may not be suitable for people who have diabetes.
Green Tea Extract.
Many diet pills contain green tea because it may increase the body’s ability to burn fat, and especially fat in the stomach area.
Although more evidence is needed, some research indicates that drinks containing green tea extract may promote the loss of fat around the stomach area. The increase in fat loss may also result in modest weight loss.
Although green tea extract is usually well tolerated, it can cause stomach pain, constipation, and nausea.
Pyruvate.
The body produces pyruvate when it breaks down sugar. Pyruvate is also sold as a supplement to assist with weight loss by helping break down fat and boosting metabolism. Pyruvate may have some effects on weight loss, existing studies are weak, so results are not conclusive.
Side effects of pyruvate include gas and bloating.
Garcinia Cambogia Extract.
Garcinia cambogia is a fruit that contains hydroxycitric acid, which is thought to help weight loss. Garcinia cambogia extract contains the juices from this small fruit and is available as a weight loss pill. Garcinia cambogia may inhibit or prevent a fat-producing enzyme called citric acid lyase.
There is little scientific evidence to support the use of this extract to help with weight loss. The effectiveness of the extract in long-term clinical trials and large-scale studies has not been proven. Although garcinia cambogia extract may not aid in weight loss, it does not appear to cause many side effects when taken in reasonable doses.