>>I read that you’re not supposed to stimulate your thyroid if your adrenals are weak
I have found this to be true in my case. I guess it could depend on the level of adrenal fatigue you have but anything that boosts my thyroid causes my adrenals to crash... Mine are in bad shape though. Sometimes megadoses of Vitamin C aren't enough.
One of the best posts/recommendations I've read regarding adrenals is here (Ties in adrenals with digestion):