Immune system tablets vitamins

I took vit c powder, probiotic powder, and green powder (grass??) with Kale (YUCK YUCK) and fruit in a green smoothie all during treatment, didn't even think to ask onc.  Panicked when I heard that you shouldn't take Vit C (although my onc said my powder was very small dose, all fine). I have read recently that probiotics are a good idea, and I wonder if they are why I never got any nausea during chemo (AC meant to be bad)??  Also wonder if that's why I ended up with Hashimotos (thyroid).  No family history, and no symptoms pre treatment.  Since treatment I have read that kale, broccoli etc should not be eaten raw as they have something in them that upsets thyroid.  I ate a lot of kale + green powder -- still wondering.  Also had my blood sugars tested so often during treatment, they were allways high, no diabetes, but they are normal now I've stopped smoothies (lots of fruit in them).  So too much fruit??  I also craved eggs (thyroid??) and milk (previously hated milk).  The egg craving has gone, but I still drink milk??  (lack calcium?)  So now I take Vit D when the sun is missing - my levels were good over summer.   So all oncs are different, all bodies are different, listen to your onc during treatment and your body after treatment.