Table 3. Motives for dietary supplement purchase in pregnant women of the NutriNet-Santé cohort study.

	Pregnant women who
Motives for dietary supplement purchase2	used supplements1
	n	%
With medical prescription or advice	476	86.7
With medical prescription	382	69.6
Following medical advice	160	29.1
Following advice of a pharmacist	102	18.6
Following advice of a dietitian	6	1.1
Following advice of another health professional	31	5.6
Following advice of a friend/family member	45	8.2
Discovered DS in the store by themselves	25	4.6
Read about the DS in a book	17	3.1
Learned about the DS from the media (television, magazine, etc.)	17	3.1
Following advice received in the store (except in a pharmacy)	7	1.3
Saw an advertisement	2	0.4
Other circumstances	24	4.4
Do not know	1	0.2

¹DS users were defined as the subjects who used dietary supplement(s) at least 3 days a week at the time of the dietary supplement questionnaire. Data regarding circumstances of dietary supplement use were available for 94% of supplement users (i.e. 549 women out of 586).

²Several answers possible.