In short, no pun intended, you can't. Putting pregnancy and illness aside, hair pretty much grows at a maximum rate of half an inch per month no matter what you do. A little faster in the summer than in the winter.

Hair is a fairly exact science called trichology and there is not much that we do not know about hair structure, chemistry and growth. Most of the Hair Voodoo out there dates back before the onset of modern science. All sorts of conclusions were drawn from what seemed like reasonable observation, but was more often than not just pure conjecture based on coincidence.

Although there is nothing that you can do to make your hair grow faster with current technology, there are a number of things that may actually slow the process such as; a poor hair care regimen, poor diet, illness, medication, male and female pattern hair loss, and emotional stress.

Some of these things don't actually affect the growth rate per se, but they affect the hairs' health and unhealthy hair will probably not grow to its fullest potential. Besides regular shampooing and conditioning with good quality products, the only other thing that you can really do is take an inexpensive daily multi vitamin such as Centrum or even Flintstones. Don't waste your money on super vitamins. Zinc and Biotin in particular seem to be good for hair and are both found in the above recommendations. Unless you are pregnant or very ill with cancer or the like, your body only requires so many vitamins per day and simply flushes out the excess. In other words, you can't put twenty gallons in a ten gallon tank.

I frequently hear of people taking pre natal pills to make their hair grow faster, even men. The reason that an expecting mother's hair may grow slower or faster has to do with hormonal activity and not the pills. So please, stop doing that.

Well, there it is. You may not like the answer, but that is the scientific facts of the matter. If you still insist on buying into the Hair Voodoo or the thousands of snake oil pitch men out there ready to separate you from your money, well, you know the expression