The markets are flooded with weight-loss products that promise miraculous results. Some of these products are chemical based while some like the one you mention herbal or ayurvedic.
Weight loss happens when the body burns excessive fat. This is possible with exercise and cutting down of calories.
Weight loss products do more harm than good. They might help you lose weight, but that weight loss will be temporary. The best way to shed weight is by watching what you eat and exercising.
Pills, powders and drinks that promise weight loss work in two ways.
1. Some kill you appetite, so you don't feel hungry. You do not eat enough food and lose weight. However, eating less food will create health problems. Your calorie intake should never be below 1000 kilo calories.
2. Another type of weight loss products consist of ingredients like psyllium husk, that when eaten absorbs water and creates bulk, making you feel full.
The weight loss will be temporary and it will be back once you stop taking them. There is also the risk of deficiencies, because the intake of nutrients will reduce.
"A love affair with knowledge will never end in heartbreak." -Michael Garrett Marino