Breast milk and formula combo feeding

Dana • Happily married and with 2 beautiful babies 💑+🙇🏼💙+👶🏼💕
I'm combo feeding and was wondering if anyone knows of a good organic formula? I tried 2, HIPP and HOLLE and both caused an allergic reaction for my baby. I really don't want to give him formula at all but I don't always produce enough milk for him and he refuses to breast feed so I have to pump.