Some of these will affect Europeans and Americans. I have made bold the things that might affect products in America or Europe.
Natural spices are commonly used by the people in Nigeria. They may be easily contaminated with heavy metals when they are dried and then pose a health risk for the consumers.
The aim of this study was to determine the levels of heavy metals in some commonly consumed natural spices namely Prosopis Africana, Xylopia aethiopica, Piper gineense, Monodora myristica, Monodora tenuifolia and Capsicum frutescens sold in the local markets of Awka, Anambra state, South East Nigeria to estimate the potential health risk.
The range of heavy metal concentration was in the order: Zn (14.09 - 161.04) > Fe (28.15 - 134.59) > Pb (2.61 - 8.97) > Cr (0.001 - 3.81) > Co (0.28 - 3.07) > Ni (0.34 - 2.89). Pb, Fe and Zn exceeded the maximum allowable concentrations for spices. The Target Hazard Quotient (THQ) of the spices varied from 0.06-0.5. Estimated daily intakes (EDI) were all below the tolerable daily intake (TDI). The lead levels in Prosopis africana, Xylopia aethiopica (Grains of Selim), Piper gineense (aka West African pepper, Ashanti pepper, Benin pepper, false cubeb, Guinea cubeb, uziza pepper), Monodora myristica (Calabash nutmeg) and Capsicum frutescens (aka Piri Piri, Kambuzi pepper, Malagueta pepper, Tabasco pepper, Siling labuyo) which are 8-30 times higher than the WHO/FAO permissible limit of 0.3 mg/kg.
"Heavy Metals Hazards from Nigerian Spices." 2016. NIH website.