(b).

Samples	Zn	Cr	V	Mn	Se#	Fe	Cu	Li	Co
NS	52.23 ± 0.95∗∗	1.18 ± 0.04	1.08 ± 0.03	21.84 ± 0.22	72.64 ± 2.98NS	478.35 ± 5.99	36.21 ± 1.08NS	0.52 ± 0.05	0.28 ± 0.02
LS	26.94 ± 1.53	1.29 ± 0.05	1.05 ± 0.02	18.51 ± 0.32	33.64 ± 5.47	497.27 ± 4.41	31.77 ± 4.99	0.23 ± 0.02	0.19 ± 0.03
BN	37.90 ± 1.84	1.60 ± 0.04	2.23 ± 0.05	36.31 ± 0.98	58.73 ± 3.92	847.64 ± 3.09	32.97 ± 3.30	0.18 ± 0.06	0.29 ± 0.01
MD	24.17 ± 1.10	1.86 ± 0.03NS	9.38 ± 0.10∗∗	82.03 ± 1.10∗∗∗	46.81 ± 5.96	1241.05 ± 3.17∗∗∗	28.61 ± 3.51	0.86 ± 0.10∗	1.48 ± 0.08∗∗∗
AC	23.25 ± 0.63	1.66 ± 0.01	1.23 ± 0.01	25.78 ± 0.38	25.47 ± 3.66	545.32 ± 7.96	18.41 ± 1.00	0.39 ± 0.05	0.25 ± 0.04
RDA	7–9 mg	25–35 µg	10–20 µg	3 mg	50–60 mcg	9–15 mg	900 µg	—	—
UL	25 mg	1000 mcg	1.8 mg	11 mg	300 mcg	25 mg	5 mg	—	—

NS: Nigella sativa, LS: Lepidium sativum, BN: Brassica nigra, AC: Aloe camperi, and MD: Meriandra dianthera.

RDA: recommended daily dietary allowance per day for adults; UL: tolerable upper intake level per day for adults [12, 13].

Concentration values are expressed as mean ± SD (n = 3); ^#concentration of Se expressed as ppb (µg·kg⁻¹).

^∗∗∗ P < 0.001, ^∗∗ P < 0.01, and ^∗ P < 0.05; NS: not significant (statistical significance compared to all the other plants).