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Nail are composed a of keratin - a type of protein - and minerals. Nails provide protection for your finger tips and are meant to be strong yet flexible, smooth and glossy. Nail health relies on sufficient supplies of protein, B vitamins, vitamin A, calcium, zinc, iodine and iron. When your body isn't receiving enough of these vital nutrients, or doesn't absorb or assimilate them properly, the deficiency may surface on your nails. 

Natural nail care means more than having a regular manicure. When people include their essential oils such as aromapathics in a basic manicure they benefit both physically and psychologically.

By using essential oils in your hand and nail care products instead of the mineral oil or other petroleum-based products that have been used in the past, aromapathic care for hands as well as nails in an natural way. However, essential oils do more than beautify the skin and nails. They can also influence moods: peppermint energizes tried hands; rosemary helps treat dry skin; lavender is calming; ginko biloba helps protect the hands from damaging free radicals; witch hazel helps improve skin tone and circulation; and horsetail has its youthful action. Any one of these can be added to your hot oil treatment, and should be present in any hand, nail, and foot product you purchase.

Read more at: http://www.bodyandfitness.com/Beauty/Health&Beauty/brittlenail.htm