Think about it. Two years is a long time for hair to be subjected to the daily wear and tear of the environment, washing, drying, brushing, combing and any chemical processing. Just imagine what a piece of silk or fine fabric would look like after 2 years of constant handling. Even if you take the best care of your hair possible, your hair still goes through a natural aging process which can also impact the growing cycle of your hair. The right vitamins and minerals play a major role in keeping your hair healthy.
Any nutritional deficiencies can lead to thinning hair or even total baldness.
It is a well known fact that an under active thyroid can result in frizzy or brittle hair while an overactive thyroid turn hair greasy and limp. The bottom line to this thread is that your hair ultimately reflects the overall condition of your body. If your body is healthy and well nourished, your hair will be your shining glory. If you are having any health problems or suffering from any nutritional deficiencies, your hair may stop growing or show damage. If your body is in good health, you can maximize your genetic growth cycle through taking the proper blend of amino acids and B-vitamins.