Table 5.

Comparison of concentrations of Co and Pb with the previous studies.

Samples	Co (μg/g)	Reference	Pb (μg/g)	Reference
Henna	2.96–3.54	[11]	11.51	[35]
			1.2 ± 0.01−0.8 ± 0.01	[13]
	0.00	[24]	0.16 ± 0.01–2.63 ± 0.24	[25]
			0.60–0.93	[26]
	141.71 ± 4.86	This study	2.60 ± 0.48	This study
Foundation	0.50	[7]	7.8–32.9 1.4	[12]
	11.1 ± 3.4	[23]	26.84	[2]
			2.8−6.4	[14]
	> 0.50	[13]	2.79 ± 0.86	This study
	59.33 ± 4.84	This study
Skin-whitening	0.20	[7]	0.5–4.5	[22]
	< 0.02–2.5	[23]	0.2997–4.7287	[15]
	0.1992–1.9931	[15]	0.05–0.14	[4]
			5.52 ± 0.046–632.60 ± 2.250	[16]
	55.62 ± 15.07	This study	1.75 ± 0.56	This study
Kohol	5.3–103	[23]	12.92–76.14	[27]
			51.1–4839.5	[28]
			2.4 ± 0.01	[13]
	39.02 ± 4.06	This study	7.22 ± 3.81	This study