Other people may have depression, anxiety, and other symptoms that may appear to be due to serotonin deficiency, but may actually be from other causes -- whether an imbalance in brain chemicals, hormones, a high amount of inflammatory substances in the brain and body, abnormal neural connections, etc.
There's really no easy way -- for instance blood studies in a doctor's office -- to tell whether someone is deficient in serotonin, and if they are, whether a 5HTP supplement would help treat their depression or other health problems.
A small amount of alcohol, such as an ounce or two of wine, should not be a danger with a 5-HTP supplement, but we caution against drinking too much.
5-HTP has not adequately been studied in children or adolescents for long term use.
Once serotonin is made, the pineal gland is able to convert it at night into melatonin, the sleep-inducing hormone.