This combination of verrucae vitamin to treat the virus rom the inside paired with the suction device and therapeutic oil to treat the verruca from the outside is a great way to take this. It is painless, safe to use for children. There are no painful freezing, burning or chemicals. The suction device draws the verrucae out of the skin instead of it growing The therapeutic oil used during this daily 10 minute procedure for 10 days also helps to fight the virus. Pregnant, breast feeding or vitamin D deficient should not take the verruca vitamins. It contains vitamin A which competes with vitamin D. You may have to take vitamin D at the same time if you are low in vitamin D.