Deva Vegan Vitamins - Glucosamine - 500 Mg - 90 TabletsDeva vegan glucosamine description: non shellfish dietary supplement 500 mg deva nutrition introduces corn derived, 100% vegan glucosamine. All ingredients used in deva glucosamine are plant and mineral based. Most other glucosamine products on the market today are produced from animal sources; mainly from the outer skeletons of shellfish, which may cause allergic reactions in those with shellfish allergies, or a possible worsening of asthma symptoms.