Marti

Nail growth is genetic, meaning the thickness of the nail plate, the speed at which they grow, and the shape of the nail plate itself. Nothing will make the matrix produce more cells, or produce them faster, than is genetically possible.

Just a little info:

Many factors determine nail growth, and each fingernail will grow at different rates. Heredity and health determine how fast the nail plate will grow, although the growth slows as we age. People who use their hands a lot usually experience a faster growth rate. The thumbnail will grow about 1 1/2 inches per year, and the left thumb will usually grow faster than the right. The index fingernail will grow the fastest, followed by the pointer and ring finger, which grow at almost the same rate. As a rule, the longer the finger, the faster the plate will grow. Nails also grow faster in summer than in winter, and faster during pregnancy. After pregnancy, the rate drops back to normal. Age also effects the growth rate with nail growth peaking between 10 and 14 years and slowly declining after age 20. Factors that slow nail growth include being immobilized or paralyzed, poor circulation, malnutrition, lactation, serious infections, psoriasis and certain medications. Some people erroneously believe that eating certain foods or using special creams, oils or lotions will increase the growth rate. Although the nail plate requires certain nutrients for proper growth, there is very little evidence that eating any particular food will cause them to grow faster. Creams, oils and lotions are sometimes sold as 'growth accelerators', although these claims are false, misleading and illegal. No cosmetic product may claim that it can alter or change any body function. These products and others are only for beautifying the nail plate, and only medical drugs can make such claims.