Serum ALP (U/L) (Colorimetric method), intact PTH (pg/L), sRANKL (pmol/L), OPG (pmol/L), and TRAP5b (U/L) (ELISAs) mean ± SD, n = 6 per treatment/control group. * = significant difference (p < 0.05) between F treatment group and control (0ppm) group. White boxes (0ppm), light grey (50ppm), and dark grey (100ppm)