Table 2.

Concentrations of the four main iridoid glycosides in the analyzed herbal products and the Veronica reference plant material (details about the herbal products can be found in Supplementary Table S1).

Product no.	Concentrations (in μg/g)
	Veronicoside	Catalposide	Aucubin	Catalpol
1	n/c	0.48 ± 0.02	1.19 ± 0.03	0.28 ± 0.01
2	n/c	n/c	1.58 ± 0.02	1.05 ± 0.04
3	n/c	3.38 ± 0.11	13.77 ± 0.52	1.52 ± 0.04
4	0.24 ± 0.01	2.10 ± 0.08	29.17 ± 1.03	5.42 ± 0.18
5	n/c	n/c	0.33 ± 0.01	0.56 ± 0.02
6	n/c	n/c	20.79 ± 0.73	n/c
7	n/c	n/c	6.01 ± 0.13	n/c
8	n/c	4.56 ± 0.16	18.24 ± 0.71	5.82 ± 0.12
9	n/c	0.22 ± 0.01	39.73 ± 1.17	2.33 ± 0.09
10	n/c	n/c	26.88 ± 0.95	3.97 ± 0.13
11	8.81 ± 0.39	0.77 ± 0.02	11.78 ± 0.43	11.46 ± 0.37
12	9.06 ± 0.41	2.01 ± 0.08	7.31 ± 0.29	9.63 ± 0.38
13	2.74 ± 0.11	2.08 ± 0.07	4.16 ± 0.17	1.92 ± 0.08
14	n/c	n/c	n/c	n/c
15	n/c	n/c	0.64 ± 0.02	0.43 ± 0.01
16	1.01 ± 0.03	0.37 ± 0.01	1.11 ± 0.04	1.12 ± 0.02
V. off 1	36.07 ± 1.8	n/c	11.32 ± 0.55	10.04 ± 0.45
V. off 2	0.29 ± 0.01	n/c	1.94 ± 0.07	3.32 ± 0.15
V. off 3	1.72 ± 0.03	n/c	1.53 ± 0.06	0.48 ± 0.01
V. off 4	0.27 ± 0.01	n/c	0.41 ± 0.02	n/c
V. cha 1	n/c	n/c	3.39 ± 0.11	n/c
V. cha 2	n/c	n/c	6.12 ± 0.29	0.87 ± 0.03
V. cha 3	n/c	n/c	7.44 ± 0.32	0.93 ± 0.02
V. cha 4	n/c	n/c	7.52 ± 0.27	2.38 ± 0.10