First of all, you need to avoid to eat any spicy foods such as hot sauces and garlic and the next thing to do is to eat sour taste juice together with Vitamin C(two tablets each day) for a week or so. It will definitely help but if you feel any stomach ache or shaking of eyelid, then it is overdosed and redudce or stop it.
Your inner health is directly reflected in the condition of your hair and nails. Drink plenty of water and eat a healthy, balanced diet. Since you say your citicles are dry, it stands to reason that your nail plate is dry as well. The nail bed releases a tidal flow of moisture and oil that constantly bathes the nail plate, keeping it moist and flexible. Our health is poor, it effects the nail plate by reducing the flow of oils and moisture released by the nail bed.
The lines you see are actually the 'rail and groove' effect upon which the nail plate rides forward on the nail bed. The 'rails' are on the nail bed, and the 'grooves' are on the nail plate. When the plate becomes dried out due to health reasons or from not wearing gloves when we have our hands in water or when using household cleaning solutions, paper and textiles, etc, one can easily 'see' these rails and grooves. This is why the nail plate splits vettically as it reaches the free edge.
If you know you do not eat as healthy as you should, then take a good daily multi-vitamin. You can re-hydrate the cuticle and nail plate by applying a good quality nail and cuticle oil at least twice daily - more often if you don't wear gloves as I said before, or if you work in an office and touch paper a lot. (Paper and textiles will 'wick' the moisture from the skin and nails, leaving then dry, cracked and brittle.
I use and recommend Botanical Oil available at Sally Beauty Supply nationwide or Solar Oil available at fine nail salons and Ulta 3 nationwide. Both oils contain jojoba and vitamin E oils. Jojoba has the tiniest molecule than can penetrate the nail plate surface and the surface layer of the skin, open up the skin pores and the nail plate cells, and allow the vitamin E to be drawn in after it. They also contain other essential oils that will moisturize and condition the skin and nails. Vitamin E is an excellent 'anti-aging' oil that will help to alleviate the free-radicals that contribute to skin and nail aging.
For more information on how to care for your natural nails, please visit my website: <A HREF="http://www.hooked-on-nails.com" TARGET=_blank>www.hooked-on-nails.com</A> It is an "educational" website for nail technicians and consumers alike.