No, it is not strictly vegan. Sparkling Ice has added vitamin D which may be sourced from lanolin. Lanolin is an ingredient derived from sheep's wool or from sea algae (which is vegan.) Although some vegans may be okay with the risk of the lanolin being from sheep's wool, stricter vegans will most likely not use this product. Additionally, some vegans oppose sucralose because it's tested on animals, and has caused benign growths and deaths in some studies.