Disclosed herein is a method for improving the health of animal or human microflora using aloe vera. A method of purifying decolorized dried aloe vera leaf juice is also disclosed. The method may include removing an aloe vera leaf from an aloe vera plant, washing and/or sanitizing the leaf, and grinding the leaf into a slurry and subsequently purifying with activated carbon. The method may remove pigmented substances including the undesirable phenolic compounds present in aloe vera latex, and in particular the anthrones aloin A and aloin B, aloesin (a chromone) and aloe-emodin (an anthraquinone). Following purification, the liquid juice may then be spray-dried to form a final dry juice powder.