The Spirulina Capsules is often sold in powder form, but it's also available in capsules, tablets, and juices. The powder is sometimes added to smoothies. Although there are a large number of blue-green algae species commonly referred to as spirulina, most spirulina supplements contain Aphanizomenon flos-aquae, Spirulina maxima, and/or Spirulina platensis. Spirulina reduces the severity of strokes and improves recovery of motor control after a stroke. Spirulina is concentrated with zeaxanthin, a plant pigment that may reduce the risk of cataracts and age-related vision loss. The offered Spirulina Capsules are very effective and made for medical uses.