Few things can make you feel better—physically, mentally, and emotionally—than a good night's sleep. And yet that healing elixir too often escapes us in this over-busy, fast-paced world. This is especially true as we get older and levels of the key hormones and neurotransmitters that contribute to mental and emotional health begin to decline. You may be able to offset this decline with natural sleep enhancers like melatonin, 5-HTP, and L-tryptophan, a serotonin precursor. In addition to encouraging regenerative sleep, many of these same substances help elevate mood and quiet anxiety, as does L-theanine, an amino acid found in soothing green tea. Doctor's Best sources the highest quality mood and sleep promoters available.