NOW Melatonin 1 mg

Our assessment

The evidence shows that while melatonin is a popular sleep aid, the specific data for NOW Melatonin 1 mg is limited. For the ingredient calcium, which is not the primary ingredient in this product, the data confirms it supports bone mineralization and neuromuscular relaxation [NIH ODS]. However, we must be clear: the data provided does not contain specific studies or health claims for melatonin itself. For calcium, high intakes might increase the risk of heart disease and prostate cancer, and can cause poor muscle tone, poor kidney function, constipation, nausea, and abnormal heart rhythms [NIH ODS].

How it works

Think of calcium as a structural builder and signal regulator — it supports bone density through mineral deposition and helps your muscles relax and nerves signal properly [NIH ODS]. For the primary ingredient, melatonin, the provided data does not include a mechanism of action. The FDA has received a total of 592,059 adverse event reports across all supplements, but specific data for this product or melatonin is not available [FDA data].

Safety profile

Based on the calcium data, side effects from high intake include 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 can reduce the absorption of medications such as bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. For melatonin specifically, side effect data is not available in the provided information.

Our recommendation

Before starting NOW Melatonin 1 mg, consult your healthcare provider, especially if you take any medications. The data does not support specific dosing or expected benefits for this product. If you are seeking to support bone health, a calcium supplement may be appropriate, but keep total intake from food and supplements within recommended limits to avoid risks [NIH ODS]. For melatonin, we cannot make a confident recommendation based on the data provided.

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