The safest and most rewarding places to buy food-grade argan oil are registered women’s cooperatives, most of which are clustered in the Souss-Massa biosphere between Agadir, Essaouira and Tiznit. A visit is typically free and involves watching the full production process: goats sometimes climb the thorny argan trees to eat the fruit and drop the nuts, women crack the hard outer shell with stones (a process that cannot be mechanised at quality scale), the kernels are roasted and ground on a stone wheel, and the oil pressed out by hand.
Well-regarded cooperatives along the N1 road north of Agadir welcome drop-in visitors. The experience takes about 20–30 minutes and there is no obligation to buy, though the prices are fair and you know exactly what you are getting. Look for cooperatives affiliated with ASPAM (the national association of argan producers) or FIMARGANE — both organisations maintain quality standards and geographic origin certification.
In the medinas of Marrakech and Fes you can find genuine culinary oil, but it requires more care. Stick to fixed-price emporia and shops with clearly labelled cooperative-sourced products. Avoid any seller who quotes a price that feels too good, or who claims the oil has medicinal certifications beyond what the cooperative label shows.
Indicative cooperative prices for culinary oil: 100 ml from ~80 MAD (~$8), 250 ml from ~180 MAD (~$18), 500 ml from ~320 MAD (~$32). Anything significantly cheaper should raise an eyebrow.