1.5-HTP and Insomnia. The relationship between 5-HTP and sleep (good sleep) has been well-established. In fact, 5 HTP supplement isseen to be better than melatonin in promoting good sleep and alleviating insomnia. It is able to increase the quality of sleep withouthangover or drugged feelings which are usually present with sleeping pills and sedatives.

2.5-HTP and Depression. Many people have already enjoyed the benefits of 5-HTP against depression. It is reportedly as effective as anti- depressants in the treatment of mild to moderate depression.

3.5-HTP and Anxiety. Low serotonin levels can lead to abnormal anxiety. With HTP, there is a good chance for serotonin to go back to its natural level, so you can feel normal again 

4.5-HTP and Weight Loss. If you would like to lose weight, 5-HTP may do wonders for you as well. An appetite too healthy may be caused by low serotonin levels. Taking in 5-HTP can normalize these levels. At the same time, 5-htp supplements can decrease your food intake by creating a feeling of fullness. It also is able to increase the secretion of the hormone leptin (an appetite regulator) thus resulting to enhanced weight loss.

5.5-HTP and Bipolar Disorder. Clinical studies have shown the anti-depressant effect of 5HTP supplement for those suffering from bipolar II disorder. 5-HTP can alleviate and reduce to improve the general quality of life of bipolar sufferers.

6.5-HTP and Fibromyalgia. One of the major benefits of 5-HTP is the help that it gives for people with fibromyalgia. It helps improve sleep while at the same time reduce depression, pain, stiffness and anxiety - all of which are symptoms of this condition. 

7.5-HTP and Headaches. 5-hydroxytryptophan supplement has also been used for treating chronic headaches such as tension headaches, juvenile headaches and migraine. These are conditions which may be related to low serotonin. 5-HTP has the ability to reduce the severity and frequency of these conditions, with fewer side effects compared to other chronic headache medications.
Application:

1.5-HTP as raw materials of drugs for anti-bacterial, anti-depressants, anti-tumor and sedation, it is widely used in fields of pharmaceutical and health products; 

2.5-HTP as insomnia, other similar symptoms of psychasthenia and lose weight product raw material, it is widely used in health products industry;
3.5-HTP as dietary supplements increased therapeutic function, it is widely used in fields of dietary supplement products;
4.5-HTP as products of sedative and anti-bacterial, they are widely used to add to beauty products in cosmetic industry.