Test-tube and animal research suggests that HCA may be helpful in weight loss because of its effects on metabolism. However, a recent, well-designed study found it ineffective. Sources HCA is not an essential nutrient. The Malabar tamarind is the only practical source of this supplement. A typical dosage of HCA is 250 to 1,000 mg 3 times daily.
Supplements are available in many forms, including tablets, capsules, powders, and even snack bars.
According to animal studies, HCA can suppress appetite and thereby encourage weight loss. However, the largest and best-designed human trial found no benefit. Another small, placebo-controlled study found no effect on metabolism. Another study tested HCA to see if it could cause weight loss by affecting metabolism, but no effects on metabolism were found. No serious side effects have been reported from animal or human studies involving either fruit extracts or the concentrated chemical.