Nestle Carnation Instant Breakfast Drink
Nestle Carnation Instant Breakfasts are peanut/nut/sesame free according to the customer service rep. I spoke to the other day. My son likes the milk chocolate flavor.
She said that all flavors are ok EXCEPT the chocolate malt. I don't recall what the issue was with it though.
I haven't found a safe vitamin for my son yet except for vitaballs, which no longer make the flavors he likes. So this at least provides a bit more nutrition than a plain glass of milk and many vitamins.