It is actually not too sweet, not to me anyway. I have diluted it with water or just given it to her plain. You also might could try the Ovaltine that you add to milk, it does have some vitamins in it as compared to just chocolate syrup. It comes in a malt flavor too which he may like better. I hope you can find something he will drink. The drinkable yogurt I bought is by Dannon. They have 90 calories, 3 g protein, 1.5 g fat, 25% dv of calcium, and 15% dv of vit d per 3 ounces. It is Dannon Danimals drinkable yogurt with calcium and vit D. It comes in vanilla, banana, and strawberry flavors that I have seen. Hope he likes it.