We recommend:

Granel Donostia
Laramendi, 23

Organic 49
Urbieta, 49

San Sebastian is a mecca for those passionate about gastronomy in general, and healthy food in particular. Local food - for geographical and climatic reasons is a very good quality. For those who enjoy integrated rice and pasta, distinguish quinoa from Gulum, prefer almond to cows milk, and are accustomed to the taste of spirulina – there are Eco Stores.  You can either go to the cozy community store Sentido Commun, next to the Bretcha market, or to the gastronomic concept-store Organic 49 located on Urbieta street in the city center.