Take D3 and see......As in 5-10 thousand iu daily. D3 is amazing cheap ..... D3 powder even more so (at Amazon/ ebay) this is what I will be putting into a foliar spray for my mango trees. With ferrous sulfate and crude animal level MSM.
I bumped the D3 in my supplements stack to 5k / day in Spring of 2020.
Also bought my first Ivermectin back in 2020, just in case.