It depends on your body conditions.
After taking 100mg of 5-HTP for several weeks, I'm pleasantly surprised by the results. My sleep is much improved; Within about an hour of taking a 100mg capsule of 5-HTP I'm relaxed, sleepy and ready for bed but, thankfully, it's not the same feeling that a person gets after taking a prescription sleep aid. In my waking time, I find that I have little craving for junky, carbohydrate-laden foods. I'm thankful especially that I no longer have a late-night hunger for sugary junk food. My mood hasn't much changed, but depression — of the type caused by brain chemistry — can be a result of a defecit of the neurotransmitters Dopamine, Norepinephrine, and Serotonin. Since 5-HTP works by stimulating the human body's own production of Serotonin, I think that a person must have depressed levels of Serotonin in order for this product to make much difference in their overall quality of life, since depression can involve other neurotransmitters. To those who already take prescription anti-depressants: Please be careful! Consult with your medical professional, since 5-HTP — together with SSRIs — can create dangerous levels of Serotonin in the brain and cause Serotonin Syndrome.
I take three of the 100 mg. capsules a day and it has really helped with depression. I didn't notice the full effects until about 2-3 weeks, so try to hang in there if you don't feel that it's benefitting much. This was a last attempt before trying another anti-depressant. I was previously on Celexa to help with mood swings/depression while taking high doses of prednisone. I believe this works nearly as well and doesn't have the Celexa side-effects of weight gain and mild personality changes.
I began with a 100 mg tablet by Natrol per day after lunch. After day 2 I started to experience light headedness, headache,dizziness, brain fog, muscle weakness/pain/numbness, vivid dreams and waking nightmares, muscle twitching, chills, chest pain.
My doctor recomended me to take 150mg per day,it is so good.