8 Supplements You Shouldn't Take If You're Trying To Lose Weight, According To Dietitians

Extracted from a tree's fruit, this supplement is said to reduce appetite and limit weight gain. However, its effectiveness is doubtful and it can cause various side effects.

Garcinia Cambogia

A dietary fiber from the konjac plant, glucomannan is believed to help you feel full. But there's no strong evidence supporting its effectiveness in aiding weight loss.


Claimed to be a fat burner, its effects on body weight are unknown, and its safety is not well established.

Raspberry Ketone

These are found in bacteria, yeasts, fungi, algae, oats, and barley and are thought to slow down digestion. However, there's no proven effect on weight loss.


While important for bones, muscles, nerves, and blood vessels, calcium supplements don't seem to help with weight loss and excessive intake can cause health issues.


Derived from the shells of crabs, shrimp, and lobsters, it's said to bind fat in the digestive tract.


Sourced from the coleus forskohlii plant, forskolin is claimed to decrease appetite and increase fat breakdown, but more research is needed to confirm these effects.


From brown seaweed and algae, fucoxanthin is thought to burn calories and decrease fat, but there's insufficient research involving human subjects.