很少有其他補充劑能像褪黑激素一樣始終有效地支持健康、深度睡眠。 事實上，褪黑激素是人體自然睡眠週期（稱為晝夜節律）不可或缺的一部分，它不僅控制覺醒和睡眠週期，還控制血壓、消化和腦電波狀態等其他生理功能。

褪黑激素由位於大腦底部的一個稱為松果體的小腺體分泌，由血清素轉化產生。 血清素本身是由氨基酸色氨酸轉化產生的，而飲食中通常缺乏色氨酸。 皮質醇是主要的應激激素，也會抑制褪黑激素的產生和吸收，導致睡眠不安。 因此，人們經常推薦褪黑激素補充劑，因為它們可能有助於支持深度、自然的睡眠和一致的晝夜節律週期。

There are few other supplements that are as consistently effective at supporting healthy, deep sleep as melatonin. In fact, Melatonin is an integral part in the body’s natural sleep cycle called the circadian rhythm, which controls not only the wake and sleep cycle, but other physiological functions such as blood pressure, digestion and brain-wave states as well.

Melatonin is secreted by a small gland located at the base of the brain called the pineal gland, where it is produced by a conversion from serotonin. Serotonin itself is created by the conversion from the amino acid tryptophan, which is often deficient in the diet. The primary stress hormone, cortisol also inhibits melatonin production and absorption, leading to restless sleep. Therefore, melatonin supplements are often recommended because they may help support deep, natural sleep and a consistent circadian rhythm cycle.

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