Any meal replacement powders gives results but it's temporary. Try to start lifestyle modification which includes Exercise regime and balanced diet to meet your fitness goals. Instead of any meal replacement powders go for protein sources like Nuts Eggs sprouts Legume  non veg in diet. Include diet high in fiber like Vegetable fruits along with this includes millets and whole pulses let the diet has oil seeds like Pumpkin Seeds Flexseeds Sunflower seeds in diet. Consult me on Practo online consultation for a personalized diet plan.

I don't advice herbal I'm for ayurvedic medicines and diet accordingly.