I’m not an expert, but sure I’ve read somewhere it should be around 150 nmol/l. Last time I had mine tested in January, it was also 79 nmol/l and GP told me to carry on taking 2 x 20,000 weekly for 2 months, then cut down to 2 x 20,000 monthly and get my levels tested again in April.
Thanks Fizzy… yes I think you are right … I googled it and ended up reading an old post from this site (!) saying same, it should be around 150 nmol/L for max’ benefit.
I think I’m going to take 5,000 iu twice a week and see about getting tested again in about 6 months.