Goji berries are small red berries from the goji plant that grows in the Himalaya Mountains (purchased as dried berries or as juice).
Chia seeds are seeds from the Chia plant (ever hear of 'Chia Pet'?) grown in Central and South America (purchased as dry seeds).
Spirulina is a cyanobacteria/blue-green algae (a dry powder or tablet)
Chlorella is a green algae (a dry powder or tablet)
I purchase goji and chia
here at Nativas and Spirulina and Chlorella from my local health-food store (I have yet to find a good online supplier)
I do harvest dandelion greens in my yard but also buy them at my local health food store as well.