Harrisan I agree with the replies to your previous post. Your nutrient levels are very low, you need to get them up to optimal levels for thyroid hormone to work properly. These are:
Vit D - 100-150nmol/L
B12 - very top of range, even 900-1000
Folate - at least half way through it's range
Ferritin - at least 70, half way through range is recommended, and for females 100-130 is considered best
Vit D - 31nmol/L - you have a long way to go. My suggestion would be to buy some D3 softgels like these bodykind.com/product/2463-b... and take 10,000iu daily for 6.8 weeks then reduce to 5000iu daily. Retest after 3 months. When you've reached the recommended level then reduce to a maintenance dose of 5000iu alternate days, you may need less in the summer.
D3 has important co-factors which are needed - read about them here vitamindcouncil.org/about-v...
D3 aids absorption of calcium from food and K2-MK7 directs the calcium to bones and teeth where it is needed and away from arteries and soft tissues where it can get deposited and cause problems. D3 and K2 are fat soluble so should be taken with the fattiest meal of the day, D3 four hours away from thyroid hormone.
Magnesium comes in different forms, check here to see which would suit you best and as it's calming it's best taken in the evening naturalnews.com/046401_magn...
Ferritin - 46 so no chance of thyroid hormone working until it reaches 70. You can either supplement with iron such as ferrous fumerate, taking each iron tablet with 1000mg Vit C to aid absorption and help prevent constipation. Or you can eat liver once a week which is how I raised mine because I couldn't tolerate iron supplements. Liver can also be 'hidden' by mincing and using in meat dishes such as casseroles, cottage pie, curry, bolognese, etc. If you take iron tablets, take them 4 hours away from Levo and two hours away from other medication and supplements as it affects their absorption.
Folate - 15.42
B12 - 264. Anything under 500 can cause neurological problems. You can supplement with sublingual methylcobalamin 5000mcg, take one daily, finish the bottle then buy the 1000mcg as a maintenance dose.
When taking B12 we also need a B Complex to balance all the B vitamins. If you buy one with 400mcg methylfolate then that will help raise your low folate level.
B vitamins can be stimulating, so best taken in the morning, no later than lunchtime so that it doesn't disturb your sleep.
TPO antibodies - 248.9
TG antibodies - 305
Both are over range so you are positive for autoimmune thyroid disease aka Hashimoto's, which is where antibodies attack and gradually destroy the thyroid. There's no treatment for Hashi's, it's the resulting hypothyroidism that's treated.
You can help reduce the antibodies by adopting a strict gluten free diet, which has helped many members here.
Read about Gluten/thyroid connection:
Supplementing with selenium, 200mcg daily also helps reduce antibodies and helps with T4 to T3 conversion. Keeping TSH suppressed helps reduce antibodies too.
Read Hashi's information here:
When introducing the supplements, start with one, give it a week or two to see if any reaction, if none then add the second one, give it a week or two, etc. If you have a reaction then you will know what caused it.
I would give the supplements time to start working and maybe retest nutrients in 3-4 months to see how they're going.
At the moment your FT4 is 43% through range and FT3 is 16.5% through range and your conversion rate is 4.4 : 1. A small increase in Levo should increase your FT4 and FT3 which could help.
If there are no sign of improving after optimising your nutrients and adding Selenium then it would be worth considering alternative thyroid hormone.