Carrot seed oil is steam distilled from the dried fruit (seeds). Carrot root oil is obtained by solvent extraction of the red carrot (root) and contains high levels of carotenes.
Carrot seed oil is a yellow or amber-coloured to pale orange-brown liquid of peculiar dry-woody, somewhat root-like, earthy odour. The initial notes are sweet and fresh, but
the tenacious undertone and dry out is very heavy, earthy, fatty-oily, slightly spicy. Normally the seed is first crushed, and then distilled with direct steam, care being taken that the steam does not form channels through the seed material in the still, which would result in a subnormal yield of oil.
Oil content can be very variable, 0.05 however, like celery seed, carrot seed can be distilled without crushing, and this will minimize the carry-over of odourless fixed oil in the distillate. Although there are no accurate medicinal data on this oil, many of the following actions are attributed to infusions or alcoholic solutions of the whole seed: anthelmintic, antiseptic, carminative, depurative, diuretic, hepatic, cytophylactic and stimulant. There are even suggestions that it might be anti-diabetic, anti-hypercholesterol and a liver regenerator.