Trend and Pattern of Herb and Supplement Use in the United States: Results from the 2002, 2007, and 2012 National Health Interview Surveys

Table 1

Prevalence of herb and supplement use among the US adult population in 2002, 2007, and 2012.

Sample size and population estimates	2002			2007			2012			Percentage change	Percentage change
	Sample	Est.	%^a	Sample	Est.	%^a	Sample	Est.	%^a	(2002 and 2012)	(2007 and 2012)
Total	30,427	201,674,075	100.0%	22,657	216,781,365	100.0%	34,525	234,920,670	100.0%
Ever taken any herbal preparations and dietary supplements	7,655	50,613,051	25.1%	5,600	55,090,245	25.4%	7,864	53,571,888	23.6%	−1.5%^**	−1.8%^**
Took herbal preparations and dietary supplements in past 12 months	5,787	38,182,843	18.9%	3,982	38,797,215	17.9%	5,974	40,579,309	17.9%	−1.0%^*	0.0%
Took herbal preparations and dietary supplements in past 30 days^b	na	na	na	2,932	28,059,181	12.9%	4,491	30,113,788	13.3%	na	0.3%

Data source: National Center for Health Statistics, 2002, 2007, and 2012 NHIS Adult Complementary and Alternative Medicine File [20–22].
Note: proportions based on weighted prevalence estimates, values for Wald chi-square tests.
^aColumn percentage.
^bThe question of the current herb use was only asked in 2007 and 2012 NHIS.
na: not available.
^*.
^**.