Hi, I'm new here. I'm hypo (5yrs) and take 87.5mcg Levothyroxine daily 30 mins before breakfast. 6 months ago I used to be v.active walking miles and working out at the gym but now can't break into a run and 1 hrs Keep Fit for over 50s makes legs ache for days!! Should I try Vit D supplements. I have 5000IU capsules. I wonder how often to take one, for how long and then what dosage for maintenance. My Vit D (25-OH) = 65.21 nmol/l, (range <25, 25-52,>200), my corr Ca 2.42 mmol/l (range 2.12=2.52). Apart from aches I feel OK. Any thoughts?