Vitamin K. Vitamin k deficiency does not lead to parasites or candida. Candida does not lead to vitamin k deficiency. Although parasites have been associated with vitamin deficiencies (for example, the tape worm and vitamin b12), I could find no association with parasites and vitamin k.
Vice versa. Parasites eat the nutrition you take in and can lead to deficiencies in many vitamins, including vitamin k. Low vitamin k levels have no effect on whether you will get a parasite or not.
Candidiasis. I am not aware of any association.