Guajava - Guajava demonstrates antifungal, antibacterial, anti-inflammatory, laxative, and analgesic properties. It is used to treat herpes ulcers, ringworm, dermatitis, and urinary tract infections. Guajava is related to cassia and senna, and contains anthraquinones found in those other species as well.
Vitamins B, particularly biotin (vitamin B7) and B12 are important to keep healthy nails. If your nutrition lacks in vitamins B, nails will be dry and brittle. Vitamin C deficiency is associated to brittle nails and may cause infections of nail tissues.
Insufficient Vitamins and Minerals. Just as a lack of protein can cause your nails to split and crack, so too can insufficient vitamins and minerals. Many people claim that it is almost impossible to get insufficient vitamins, minerals and proteins in our diets but that just isnt true.