Avinol PM is available at AvinolPM.com, as of June 2015. The company markets the over-the-counter sleep aid as a 100-percent natural, nonaddictive alternative to sleeping pills. Melatonin and 5-HTP are active sleep-inducing ingredients in Avinol PM.
Medical studies show that individuals deficient in melatonin suffer insomnia, fatigue and irritability, according to the company website. Avinol PM helps restore the body's melatonin levels, which reduces symptoms and allows restful sleep. Melatonin is also linked to improved brain function and long-term memory. Proper levels of Avinol PM's ingredient 5-HTP, the substance that triggers the neurotransmitter serotonin, can heighten mood and improve sleep patterns. Generally, people begin to feel sleepy within minutes after taking the melt-in-your-mouth tablet.