On the "allergic to something in Strategy" front (lots of serious allergies with my family+pets, it's the worst!), before adding any new supplement-type things, I'd compare ingredient lists between Life Design and Strategy. Then, stay away from adding things with ingredients (if any) that Strategy has but Life Desgin doesn't.
It would be terrible to have it be an ingredient allergy and take him off Strategy, only to add something with the same ingredient he's allergic to.
I've done that (my cat is extremely allergic to fish) and it was terrible. It felt like we were just going in circles symptoms-wise but really, all it was was me making the same mistake over and over.
Fabio - 13 year old Arab/QH gelding
Hazel - 14 year old Angora goat
Atticus - 4 year old LaMancha/Alpine cross goat
Rest peacefully, Lacey.