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 signs. 1  Brittle nails that split easily may indicate an fatty acid, protein, Vitamin A deficiency, Iron or Calcium deficiency. 2  Nails with white flecks or lines may result due to a Zinc or Vitamin B6 deficiency.3  Nails that tend to broaden and curve downwards at the tip may be a symptom of lung damage. Brittle nails that split easily may indicate an fatty acid, protein, Vitamin A deficiency, Iron or Calcium deficiency. 2  Nails with white flecks or lines may result due to a Zinc or Vitamin B6 deficiency. 3  Nails that tend to broaden and curve downwards at the tip may be a symptom of lung damage.