Weight Gain Appetite Stimulant Gainer 2 Pieces (48 Days) Promass weight gainer regulates metabolism with 10 different herbs contained in it - stimulates appetite - eliminates tapeworms etc - and ensures that the nutritional values of foods are taken into the body more effectively. If you use it regularly, you can gain an average of 4-8 kg of weight per month. However, this varies depending on your metabolism rate, nutrition, sleep patterns and appetite. How to use? Mix 1 pack of 6gr of the product into 1 glass (150-200ml) of cold or warm milk or fruit juice, twice a day, in the morning and evening, and drink 20 minutes after meals.