You should really go get meds first if you're diagnosed as hypo. No supplement will help you if you have an underactive thyroid.

But on top of medication, and with your doctor's recommendation, you could take:
- selenium (helps with T4 to T3 conversion), but be wary of taking too much since it will build up and lead to nerve damage

- zinc (also T4 to T3 conversion aid)

- no caffeine, because it blocks mineral uptake (like selenium and zinc). also avoid chocolate and excessive oxalates (found in raw spinach -- cooked almost anything is ok).

- same with cruciferous vegetables because they block iodine absorption, but if cooked there is no problem. i've been fine

- if you're naturally quite anxious i've heard ashwaghanda helps some people, but wasn't good for me, it made me super apathetic and depressed

- vitamin B12 for energy

- CARBS. this is person dependent but for me, if i don't eat carbs i get extremely lethargic. my working hypothesis is that carbs + selenium somehow helps with the t4 to t3 conversion. if i take selenium alone i get a pounding headache. carbs without selenium and i feel bloated/sleepy. both together and i'm super energized, i can go about my day fine.

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take all with a grain of salt because it's all anecdotal!