Table 2.

National nutrition surveys citing dietary supplements in 16 European countries in the period 2000–2020.

Country	Name of Survey	Study Period	Number of Participants	Age Range, Years	Dietary Method	Reference
Belgium	Belgium National Food Consumption Survey (BNFCS) 2014	2014–2015	3146	3–64	FFQ, 2 × 24 h recall. Face-to-face electronic interview.	[26]
Denmark	Danish National Survey of Dietary Habits and Physical Activity	2000–2004	4479	18–75	Pre-coded 7day dietary record, personal interview.	[23]
Finland	The National FINDIET 2017 survey	2017	3099	18–74	2 × 24 h recall. Face-to-face interview and telephone.	[22]
France	INCA 3	2014–2015	5800 (3157 adults 2698 children)	0–79	Specific questionnaire face-to-face interview for a 12-month period for adults.	[31]
Germany	NVSII—German National Nutrition Survey (Nationale Verzehrstudie II)	2005–2007	13,753	14–80	2 × 24 h recall. Face-to-face electronic interview.	[30]
Greece	HYDRIA—Greek national diet and health survey	2013–2014	4011	>18	2 × 24 h recall; FPQ questionnaire. Face-to-face interview.	[27]
Hungary	Hungarian Dietary Survey 2009-OTAP2009	2009	4992 (3982 adults)	0–101	Targeted questionnaire on DS; 3-day diary, FFQ.	[29]
Ireland	National Adult Nutrition Survey 2011 (NANS)	2008–2010	1500	18–90	4-day semi-weighed food diary (consecutive). Self-completed.	[37]
Italy	INRAN-SCAI, The third Italian national food consumption survey	2005–2006	3323	0–98	3-day diary (consecutive). Self-completed.	[35]
Netherlands	DNFCS—Dutch National Food Consumption Survey 2012–2016	2012–2016	4313	1–79	2 × 24 h recall and 1-day food diary (some age groups), FFQ.	[25]
Poland	National Dietary cross-sectional Survey	2019–2020	1831 adults	>18	FPQ, 2 × 24 h recalls.	[34]
Portugal	IAN-AF 2015–2016—The National Food, Nutrition and Physical Activity Survey of the Portuguese general population	2015–2016	5811	3 months–84	2 × 24 h recall (non-consecutive) and FPQ (electronic interview), Face-to-face electronic interview.	[28]
Spain	ENALIA2	2013–2015	1033	18–74	FPQ, 2 × 24 h recalls	[33]
Sweden	Swedish National Dietary Survey—Riksmaten vuxna, 2010–2011	2010–2011	1797	18–80	4-day food diary (consecutive). Self-completed via web.	[32]
Switzerland	MenuCH—National Nutrition Survey menuCH 2014–2015 (Nationale Ernährungserhebung menuCH = Enquête nationale sur l’alimentation menuCH = Sondaggio nazionale sull’alimentazione menuCH)	2014–2015	2085	18–75	Self-administered dietary questionnaire. 2 × 24 HDR.	[24]
UK	National diet and Nutrition Survey (NDNS)	2008/09–2011/12	6828 (3450 adults)	>1.5	4-day food diary. Face-to-face interview.	[36]