animal drugstore biotin powder herbs for dogs and cats 1Biotin Extra 200 gr In addition to biotin (2000 mg p kg), Biotin Extra contains herbs that naturally have a high sulphur content, such as dandelion, marigold, nettle, fenugreek, seaweed, garlic and rosemary. Sulphur is a binding substance of collagen, the main component of cartilage, and ensures good blood circulation. Biotin extra more than provides the daily requirement for the amount of Biotin (vitamin H). Administering extra biotin improves the