The rate of urbanization in developing countries imposes to develop standards for efficient food security. This study was conducted in 2013 in Libreville, Gabon to evaluate the metal concentration in three leafy vegetables commonly consumed in West Africa. Amaranthus cruentus (Amaranth), Hibiscus sabdariffa (Roselle) and Manihot esculentus (Cassava) were sampled in seven markets of Libreville (Gabon) and analyzed for their concentration in Al, Ca, Fe, K, Mg and P using ICP-AES. The concentration ranges found were 11-173 mg/kg, 5897-24911 mg/kg, 135-1220 mg/kg, 1531-9728 mg/kg, 1470-7146 mg/kg and 186-1277 mg/kg for Al, Ca, Fe, K, Mg and P, respectively. These results indicated that amongst the leafy vegetables studied, Amaranthus cruentus was the best source of nutrients (Ca, Fe, K, Mg and P). However concerns could be raised for the some high aluminum content found in these leafy vegetables which may be detrimental to human and animal health.