Abstract
We compared the phytochemical constituents and antioxidant activities of three important species of Lamiaceae in Algeria (Mentha spicata, Ocimum basilicum and Thymus algeriensis). We noticed that the M. spicata species contains the largest fraction of phenolic and flavonoid products (231 and 22 mg / g) than the other two species studied. Other hand we founded that the two species M. spicata and T. algeriensis show excellent antioxidant activity in the ethanolic extract according to the two tests (DPPH and ABTS) compared to the ascorbic acid of reference. But the specie O. basilicum has good antioxidant activity in aqueous extraction. This Lamiaceae family takes an important place in the lives of Algerians citizens, so this species are very good source of natural antioxidant compounds in algerian traditional medicine.
 Keywords: Antioxidant activity, Lamiaceae, Mentha spicata, Ocimum basilicum and Thymus algeriensis, DPPH.
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