One of the principles of naturopathic medicine is to "treat the cause." Some possible causes of nail splitting is poor mineral absorption due to decreased stomach acid or dietary insufficiencies. So, you can increase your stomach acid production by drinking a little apple cider vinegar in some water shortly before meals. This will tend to stimulate stomach acid production. Ensure your diet includes a lot of mineral-rich dark leafy green vegetables. Also, another cause of nail splitting can be an endodrine imbalance resulting from thyroid insufficiency. So, you may want to have your thyroid hormones checked by your health care practitioner.
answered by Dr K B N