Table 1.

Comparison of total body 25(OH)D in blood plasma and skeletal muscle.

	Blood Plasma Volume (L)	Muscle Mass (kg)
Total for 70 kg human	2.7–4.3 L [23]	21–26.6 kg ## [22]
25(OH)D concentration	20 µg/L ###	1–3 µg/kg #### [21]
Total body 25(OH)D	54–86 µg	21–80 µg

^## Assuming body mass of 70 kg, ^### Minimum adequate status 25(OH)D concentration, ^#### Assuming human muscle has similar 25(OH)D concentrations to sheep and cattle.