Table 1.

Echinacea formulations

Manufacturer	Species	Plant part	Preparation	Standardization	Stated amount of marker (mg)	Measured amount marker (mg) (average of two lots)	Percent of label claim	Suggested servings per day	Total daily dose of marker compound (mg)
a	Echinacea purpurea	Herb and root	Extract	TLC1 and FTIR2	—	5.7 ± 2.0	—	6	34.2
b (1)*	Echinacea purpurea	Herb	Powder	N/A	10	15.3 ± 0.4	153 ± 4%	3–9	45.9–137.7
b (2)*	Echinacea purpurea and Echinacea angustifolia	Herb and root	Powder with extract	Echinacoside	—	9.6 ± 0.7	—	2	19.2
c	N/A	N/A	N/A	N/A	10	13.9 ± 0.2	139 ± 2%	1–4	13.85–55.4
d	Echinacea purpurea	Whole plant and root	Extract	4% phenolics	5	5.4 ± 0.2	107 ± 5%	2	10.8
e	Echinacea purpurea	Aerial	Powder	N/A	—	12.6 ± 0.2	—	6–9	75.6–113.4
f	Echinacea purpurea	Root	Extract	Acylamides >0.3%	—	3.5 ± 0.4	—	2	7
g	Echinacea purpurea	Whole plant and root	Extract	4% phenolics	5	5.2 ± 0.7	104 ± 14%	2	10.4
h	N/A	N/A	N/A	N/A	3	5.2 ± 0.2	173 ± 7%	2	10.4
i	Echinacea angustifolia and/or pallida	Root	Powder	N/A	5	3.9 ± 0.3	78 ± 7%	2	7.8

¹Thin Layer Chromatography.

²Fourier Transform Infrared Spectroscopy.

*Reported as two separate products since different preparations were sent; N/A = information not available.