Natrol Advanced Sleep Melatonin 10 mg

Our assessment

The evidence shows that this product contains 10 mg of melatonin, which is a high dose. For most adults, starting doses of 0.5 mg to 5 mg are more common. Data not available for this specific product's efficacy from the provided studies. Calcium is listed as an ingredient in the data, but its role in sleep is not supported by the provided mechanism data [NIH ODS].

How it works

Calcium, listed in the product data, works by supporting bone mineralization and neuromuscular relaxation, which helps with muscle relaxation and nerve signaling [NIH ODS]. Melatonin’s mechanism for sleep is not detailed in the provided data. You should be aware that the primary active ingredient, melatonin, works with your body’s natural sleep-wake cycle, but specific details are not available from the provided information.

Safety profile

FDA received 592,059 total adverse event reports across all supplements, but specific report counts for this product are not available. For the calcium component, high levels in the blood and urine can cause constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium supplements may reduce the absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available for side effects specific to melatonin at this dosage from the provided data.

Our recommendation

Start with a lower melatonin dose, such as 1 mg to 3 mg, before considering 10 mg. Because calcium can interfere with several medications, take this product at least two hours apart from any prescription drugs [NIH ODS]. Given the limited data provided on this specific product’s safety and efficacy, consult your physician before use, especially if you have kidney issues or take thyroid or antibiotic medications [NIH ODS].

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide