This is a question that I hear quite often in my chair. Most women want longer or thicker hair. In most cases you always want what you don't have. There are so many things that go into maintaining healthy hair. First you have to find the best hairstylist for your lifestyle. No matter how great the hairstylist may be, you still have to do your part at home. If you are damaging your hair in between visits, then it's not a whole lot your stylist can do. If we treat your hair when you come for visits and you abuse it at home, you've defeated the purpose. I'm going to list a few things that you can do to activate hair growth. Keep in mind that if you have never had hair down your back chances are you never will. Genetics has everything to do with you hair, look at your families hair structure, it will give you an idea of what to expect in your hair journey. There are a few ways to stimulate hair growth.
The first way is biotin vitamins. Biotin is a water soluble B-complex vitamin and is helpful in maintaining blood sugar. Biotin is great for strengthening hair and nails. I have recommended this vitamin for years and it has grown and strengthened my clients hair. For the best results its good to be consistent.
In some cases hair needs to be reconstructed. When a reconstructor is done, protein is put in the hair and it rebuilds it. After this process is done, hair is strong and all together healthier (*egg is a great source of protein, try an egg treatment on your hair). Keeping your hair moisturized is a must, if hair is dry then hair won't grow properly. If you feel your hair and you get to the ends and they are dry, it's time for a trim. If you don't get your ends trim, then your hair split up the hair shaft and in turn it will break (hair should be trimmed every 6-8 weeks) .
Olive oil is great for hair, 100% cold pressed olive oil (straight out of the bottle and a little goes a long way). Olive oil that is sold in the beauty supply is diluted and mixed with other ingredients, so it's best to buy it as an oil.
Flaxseed oil is great for your hair as well. I take the gelcap vitamins, it's also sold as a liquid and as a seed. Trader Joe's is a great place to get all forms of flaxseed.
For balding or thin areas, sulfur 8 is excellent. You spot it on the affected area and it will gradually grow out hair. It has a strong smell, but it really works. Sometimes the hair follicle is damaged in which cases hair will no longer grow in the area. You can usually feel if there is a follicle present.
The most important thing is that hair is healthy first and hair growth will follow. I'm not saying expect unrealistic results, but if you take care of your hair it will be reflected.