What are pro milk 50 rtdspro milk 50 rtds are a ready to drink luxurious tasting milkshake with over 50g of protein per serving each flavour is designed to provide a velvety texture with a natural taste making them a great alternative to your usual protein supplements pro milk 50 rtds come in a 500ml bottle which makes them ideal for when on the go and looking for a quick intake of protein the screw top cap also makes the product convenient for consuming across the day to increase daily