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.
Nail issues are a concern for many people. Weak or brittle nails are prone to slow growth, breaking, and peeling. The medical term for this is onychoschizia. There are multiple potential causes of flaky brittle nails ranging from benign to potentially more serious conditions. Weak nails are a very common symptom of menopause due to fluctuations in hormones. During menopause the level of estrogen is lowered.