Thảo dược rau samRau sam, tuy là một loài rau dại thường mọc ở ruộng, vườn, bờ hoang nhưng vừa có thể làm rau ăn, vừa làm thuốc chữa bệnh.
Rau sam có tên khoa học là Portulaca oleracea, thuộc họ Portulacaceae, lá có vị chua, thân mọng nước.Trong rau sam chứa khá nhiều các axít béo omega-3 (chiếm tỉ lệ cao trong các loại rau), ngoài ra còn có vitamin B, C, các chất khoáng dinh dưỡng như magiê, canxi, kali và sắt.Theo Đông y, rau sam là loại rau có tính hàn, không độc, tác dụng thanh nhiệt, chống viêm, giảm đau ngứa, chữa táo bón, kiết lỵ, bệnh ngoài da, bệnh đường tiết niệu...
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