Should I supplement T4?

[Godfather1]

Hi,

I take 5 IU of HGH daily before bed.
However, my free T4 is a bit low.

Values: TSH: 1.91 mIU/L
fT3: 3.02 ng/L
fT4: 0.87 ng/dL

Would you recommend supplementing with T4?
If so, can T4 be used for both bulking and cutting phases?
What dosages are used, and when should the levels be checked again in the lab?

Thanks!