Source Naturals Sleep Science Melatonin Peppermint Flavor 5.0 mg

Our assessment

The evidence shows that this product contains 5.0 mg of melatonin per serving. We do not have specific efficacy data for this exact formulation. However, when considering calcium as a general supplement category, data on high calcium intake is available. Some research suggests that high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Data not available for melatonin-specific studies from the provided list.

How it works

Think of calcium as a structural builder — it supports bone density and mineral deposition through bone mineralization. It also plays a role in neuromuscular relaxation, supporting muscle relaxation and nerve signaling [NIH ODS]. Data not available for the specific mechanism of melatonin from the provided data.

Safety profile

FDA received a total of 592,059 adverse event reports across all products. For calcium specifically, high levels in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, 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 several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Because we lack specific safety and efficacy data for this melatonin product from the provided sources, our recommendation is limited. For calcium, be cautious with high intakes due to the risk of heart disease and prostate cancer [NIH ODS]. Always consult your healthcare provider before starting any new supplement, especially if you take prescription medications that interact with calcium [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