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.
Primary hypothyroidism - Brittle finger nails Psoriasis; Reiterâs syndrome - brittle fingernails Scalp -- ear -- nipple syndrome - brittle fingernails Secondary hypothyroidism - Brittle finger nails Soto's Syndrome - brittle fingernails Tertiary hypothyroidism - Brittle finger nails Xeroderma. Brittle fingernails: Tools. Symptom Checker Â» Drug side effect causes of Brittle fingernails . The following drugs, medications, substances or toxins may possibly cause Brittle fingernails as a side effect. 1  Oxypentifylline. 2  Trental. 3  Cyclosporine. 4  Sandimmune. 5  Consupren.