Magnesium vs Ashwagandha vs Melatonin: Which One for Which Job?
Magnesium, ashwagandha and melatonin do three different jobs. Magnesium is a mineral your body uses every day, including for muscle and nerve function. Ashwagandha is an herb that traditional Ayurvedic medicine uses as an adaptogen, usually taken daily for weeks. Melatonin is a hormone your brain makes in the dark, and it is taken only at night.
Three ingredients, three different jobs
These three often show up side by side in the evening aisle, so it is easy to think they are the same thing. They are not. One is a mineral, one is a plant and one is a hormone. They work on different timescales, and each has its own safety notes.
| Magnesium | Ashwagandha | Melatonin | |
|---|---|---|---|
| What it is | A mineral | A plant root (Withania somnifera) | A hormone |
| Its job | A daily nutrient for muscle and nerve function | A traditional adaptogen, taken as a daily habit | A nighttime signal tied to darkness |
| When to take it | Any time you will remember each day | Daily, as the label directs | At night only, before bed |
| In the Nuvazen Calm ritual | NuvaMag | CalmZen | SleepZen |
| Main caution | Upper limit of 350 mg a day from nutrition products and medicines | May not be safe in pregnancy or breastfeeding; can interact with some medicines | Long-term safety is not well studied |
Magnesium: the daily mineral
Magnesium is a mineral your body needs every day. The NIH Office of Dietary Supplements says it is important for many processes in the body, including regulating muscle and nerve function. It also plays a part in making protein, bone and DNA.
Adult men need 400 to 420 mg a day, and adult women need 310 to 320 mg, from food and nutrition products combined. Good food sources include legumes, nuts, seeds, whole grains and leafy greens such as spinach.
There is also an upper limit. Adults should not get more than 350 mg a day of magnesium from nutrition products and medicines, unless a doctor advises it. Too much can cause diarrhea, nausea and stomach cramps. Magnesium in food does not count toward this limit.
Magnesium is not tied to the clock. Take it at a time you will remember, such as with dinner or breakfast. Our guide on the best time to take magnesium covers timing in more detail.
Ashwagandha: the traditional adaptogen
Ashwagandha (Withania somnifera) is an evergreen shrub. Most products use its root. The NIH Office of Dietary Supplements explains that ashwagandha root has long been used in traditional Ayurvedic and Unani medicine as an adaptogen. That is a loose term for something believed to help the body handle stress.
Ashwagandha is a daily habit, not a one-night tool. In the studies the NIH reviewed, people took it every day for about 6 to 8 weeks, and some trials ran up to 90 days.
The NIH says ashwagandha appears well tolerated for up to about 3 months. The most common side effects are mild: stomach upset, loose stools, nausea and drowsiness. Rarely, people have had liver problems. Ashwagandha may also affect the thyroid.
Melatonin: the nighttime signal
Melatonin is a hormone your brain makes in response to darkness, according to the National Center for Complementary and Integrative Health (NCCIH). Most melatonin products are made in a lab.
Because it is linked to darkness, melatonin belongs at night only. It is the one ingredient of the three where timing really matters.
NCCIH says short-term use appears safe for most people, but information on long-term safety is lacking. Mild side effects can include headache, dizziness, nausea and sleepiness. Melatonin may also stay active longer in older adults, which can cause daytime drowsiness.
Which one for which job?
- You want a steady daily nutrient. Magnesium fits here. It is part of your daily intake, like the magnesium in your food.
- You want a daily herbal habit. Ashwagandha fits here. It is taken every day and used over weeks, not hours.
- You want something for the half hour before bed. Melatonin fits here. It is for nighttime only.
None of them replaces good sleep habits. Water, food, daylight, movement and a steady bedtime are the foundation. Our 30-minute bedtime routine is a simple place to start.
Can you take them together?
Some people take more than one. If you do, check the numbers and talk to your doctor first, especially if you take any medicines.
- Magnesium adds up. NuvaMag has 275 mg of magnesium and SleepZen has 13 mg. Together that is 288 mg, which is under the 350 mg upper limit. Count any multivitamin or electrolyte mix too.
- Ashwagandha can double up. CalmZen contains ashwagandha, and SleepZen's blend contains it too. Tell your doctor if you plan to take both.
- Melatonin stays at night. Keep SleepZen for bedtime only, even if you take the others during the day.
How the Calm ritual uses each one
NuvaMag
NuvaMag provides 275 mg of elemental magnesium from 2,500 mg of magnesium glycinate in each three-capsule serving. It has no melatonin, so you can take it at any time of day. Take three capsules once a day with water.
CalmZen
CalmZen contains 650 mg of organic ashwagandha root and 5 mg of organic black pepper in each capsule. Take one capsule twice a day, 20 to 30 minutes before a meal, with an 8 oz glass of water.
SleepZen
SleepZen is for nighttime only. Each two-capsule serving has 10 mg of melatonin, 1.8 mg of vitamin B6, 17 mg of calcium and 13 mg of magnesium. It also has a 905 mg blend that includes chamomile, lemon balm, passion flower, L-theanine, GABA, ashwagandha and St. John's wort. Take two capsules 20 to 30 minutes before bed with an 8 oz glass of water. Many people start with a lower amount of melatonin than 10 mg, so ask your doctor or pharmacist whether this amount is right for you.
See how they fit into one evening on The Midnight Entry ritual page, or browse the Calm collection. Nuvazen products are made in FDA-registered, GMP-compliant facilities, with a Certificate of Analysis (COA) for every product.
Who should check with a doctor first
All three labels say to talk to a doctor first if you are pregnant or nursing, under 18, or have a medical condition. A few points need extra care:
- Magnesium and medicines. The NIH Office of Dietary Supplements says magnesium can lower how well some antibiotics and bisphosphonates (osteoporosis medicines) are absorbed. Some diuretics and long-term acid reflux medicines can change your magnesium levels.
- Ashwagandha. It may not be safe during pregnancy or breastfeeding. It might interact with thyroid medicines and with medicines for blood sugar, blood pressure or the immune system, as well as sedatives.
- Melatonin. NCCIH says people with epilepsy and people taking blood thinners should use it only under medical supervision.
- St. John's wort in SleepZen. NCCIH says St. John's wort can weaken the effects of many medicines, including some antidepressants, birth control pills and the blood thinner warfarin.
Related reading: Magnesium Glycinate for Sleep: What the Evidence Shows and Magnesium Glycinate vs Citrate: What's the Difference?
Frequently asked questions
Is magnesium the same as melatonin?
No. Magnesium is a mineral you need every day from food. Melatonin is a hormone your brain makes in response to darkness. They do different jobs and are taken on different schedules.
Can I take magnesium and melatonin together?
SleepZen already pairs melatonin with a small amount of magnesium (13 mg). If you add NuvaMag or another magnesium product, keep your total from nutrition products under 350 mg a day. Check with your doctor first if you take any medicines.
How long do people take ashwagandha?
Ashwagandha is used as a daily habit rather than a quick fix. In the studies the NIH reviewed, people took it daily for about 6 to 8 weeks. The NIH says it appears well tolerated for up to about 3 months.
Can I take melatonin every night?
NCCIH says short-term use appears safe for most people, but there is little information on long-term safety. If you find yourself relying on it most nights, talk to your doctor.
Sources: NIH Office of Dietary Supplements, Magnesium Fact Sheet for Consumers; NIH Office of Dietary Supplements, Ashwagandha Fact Sheet for Health Professionals; NCCIH, Melatonin: What You Need To Know; NCCIH, St. John's Wort: Usefulness and Safety.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
