Natrol Melatonin 5 mg Fast Dissolve Strawberry Flavor

Our assessment

The evidence shows that this product contains melatonin, a hormone that helps regulate your sleep-wake cycle. For a 5 mg fast-dissolve strawberry tablet, the data indicates this is a relatively high starting dose. Our assessment: while melatonin can be effective for sleep support, you should be cautious with a 5 mg dose. Data on the specific ingredient calcium in this product is limited, as the label specifies "See label" for ingredients, and the provided data only covers calcium, not melatonin specifically [NIH ODS].

How it works

Think of melatonin as a natural sleep signal — it tells your body it is time to rest. The 5 mg fast-dissolve format is designed to be absorbed quickly in your mouth, bypassing the digestive system for a faster onset. Regarding the calcium listed in the ingredient data, it works by supporting bone mineralization and neuromuscular relaxation, but this mechanism is separate from melatonin's primary sleep-regulating effects [NIH ODS].

Safety profile

FDA received a total of 592,059 adverse event reports across all supplement categories. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer, and can cause constipation, nausea, weight loss, extreme tiredness, and abnormal heart rhythms [NIH ODS]. However, specific side effects and report counts for melatonin 5 mg are not available in the provided data — you should be aware that drowsiness is a common effect, and the FDA data does not provide a breakdown for this specific product. Calcium can also reduce the absorption of medications like bisphosphonates and certain antibiotics, so timing your dose is important [NIH ODS].

Our recommendation

Start with a lower dose if you are new to melatonin — 1 to 3 mg is often sufficient. Take this 5 mg tablet only 30 to 60 minutes before bed. Do not drive or operate machinery after taking it. If you take any medications, especially thyroid medication or antibiotics, consult your pharmacist about potential interactions with the calcium component [NIH ODS]. For the best results, use melatonin short-term and focus on good sleep hygiene.

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