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- A recent study found melatonin was safe and people handled it well, even older adults with mild cognitive impairment.
- Though they didn’t see big improvements in thinking abilities, the study helped make bigger dementia studies possible, even those people can do at home.
- Melatonin’s antioxidant and anti-inflammatory properties suggest it might help protect the brain as it gets older.
- Researchers say they need longer studies with more kinds of people to see how well melatonin really works.
- They saw small increases in brain glutathione levels, but couldn’t be sure they were real because the study was small.
Melatonin is best known for helping people sleep naturally. But lately, people have become interested in it not just for sleep, but because it might help with memory problems getting worse, like dementia and Alzheimer’s. Scientists are looking into whether melatonin might help stop dementia. More and more findings hint it might be more important for brain health, especially for older people whose memory might get worse. But does the science back it up?
What is Melatonin – More Than Just a Sleep Aid?
Melatonin is a hormone. It’s mostly made by a small part of the brain when it’s dark. It’s key for controlling your body’s natural sleep-wake clock. While melatonin usually helps people sleep, especially if they have jet lag or trouble sleeping, it does other things in the body too. This makes it interesting for older brains and diseases that harm the brain.
Not many people know this, but melatonin is also a strong antioxidant. It stops harmful things called free radicals, which causes less oxidative stress. This stress really adds to cells getting old and brain problems. Oxidative stress happens when your body doesn’t have enough antioxidants to fight free radicals. This hurts your cells, proteins, and DNA. Scientists think this process plays a big part in causing Alzheimer’s and other memory problems.
And, melatonin helps calm down swelling (inflammation). Brains of people with Alzheimer’s and other dementia often show long-lasting swelling. Studies on animals and early tests show melatonin can calm down the steps that cause swelling and lower signs of swelling in the brain. This adds to the idea it might help protect the brain.
To wrap up, people use melatonin a lot for sleep. But it also helps fight oxidative stress and swelling. This makes it seem like a good thing to study for memory problems and dementia.
Melatonin and the Aging Brain: The Scientific Reasons
As your brain gets older, it’s not as good at fighting off oxidative damage and swelling. This means older people are more likely to get brain diseases like Alzheimer’s and other types of dementia. Specifically, oxidative stress and problems with brain cells’ power parts are known signs of Alzheimer’s in the cells.
Glutathione is sometimes called the “master antioxidant”. It’s really important for stopping oxidative damage and keeping the brain healthy. Sadly, studies show people with memory problems, like mild cognitive impairment or Alzheimer’s, often have much lower levels of glutathione in their brains.
Because melatonin is a strong antioxidant, people think it might help make or keep glutathione levels up. It doesn’t just grab free radicals itself. It also helps the body make more antioxidant helpers, like an enzyme called glutathione peroxidase. Doing both these things means melatonin might fight different kinds of stress on the brain at the same time.
What’s more, there are lots of places in the brain that grab onto melatonin, especially in areas important for memory and thinking, like the hippocampus. This fits with the idea that melatonin could be useful for conditions related to dementia. Early studies on animals and small groups of people hint that melatonin could help brain connections work better, lower sticky clumps called amyloid plaques, and boost overall brain function.
So, there are solid scientific reasons to study how melatonin affects brain health. But just thinking it might work isn’t enough. We need proof from studies with people.
Inside the Trial: How it Was Done and What They Hoped For
An interesting study was done in Sydney, Australia. They wanted to see if the good things scientists thought melatonin might do would actually show up in people. The team found 40 adults aged 60 to 80. All of them had mild memory problems but could still do everything they needed to on their own.
The study’s main point was to see if a bigger, final study on melatonin and memory could actually be done. To figure this out, they put the people into two groups by chance. One group took a big dose of melatonin (25 mg) every night for 12 weeks. The other group got a dummy pill. The idea was to check how easy it was to run the study – like if people took the pills, if they had side effects, and if they could do the memory tests and sleep tracking at home.
Something special about this study was that it was done remotely. They had to do this because of the COVID-19 pandemic. People learned how to track their sleep themselves, do memory tests on the computer, and talk to the doctors by video calls. Some people also had special brain scans to check glutathione levels. Doing things this way was key for safety during the pandemic. It also helped them see if future studies on people with memory problems could be done from home.
The study focused on can we do this? instead of does it work? This prepares the way for bigger and better studies later.
Is Melatonin Safe for Older Adults with Memory Problems?
A really good piece of news from the study was that melatonin seemed very safe, even taking a pretty big dose (25 mg) every day. Nobody in the study said they had serious bad effects from the melatonin. They saw about the same number of small side effects in both the melatonin group and the dummy pill group. This means melatonin seemed no more risky than a sugar pill, at least for a short time.
Most people took the pills just as they were supposed to. This was really good. More than 90 out of 100 people who were asked to join said yes, and almost everyone finished all 12 weeks. This shows people were happy to take the melatonin. It also shows older adults, even with memory problems, could handle the tests from home.
In the US, the FDA doesn’t control melatonin like a medicine. It’s sold as a supplement, so how good it is and the dose can be very different depending on the brand. But in studies using pure melatonin, it has always looked safe. This helps doctors and people feel safer about trying melatonin in studies about dementia.
What the Study Found—And Didn’t Find
Even though the study was mostly about if they could do it, the scientists still looked at changes in the body and in thinking abilities. Sadly, the results didn’t show clear proof that melatonin really changed how the brain worked in just 12 weeks.
One main thing they checked in the body was how much glutathione was in the brain. They saw a small bump in one part of the brain, but the numbers weren’t strong enough to be sure it was real. It probably happened because the groups were a little different to start, not because of the melatonin.
Tests for mood, memory, and sleep also didn’t show clear differences between the group taking melatonin and the group taking the dummy pill. Still, they did see small trends that weren’t quite strong enough to count, like people feeling like they slept a bit better and a slight hint of better working memory. This gives a little hope.
So, the small study showed melatonin was safe and that a bigger study could be done. But it didn’t show clearly that melatonin works for memory problems, at least not in just 12 weeks with only 40 people.
Feasibility: A Win for Studies Done from Home
The results about body chemistry weren’t clear. But the study did show how to run things well, and this helps make future studies possible.
The study proved older people, even with mild memory problems, can do complex study steps like:
- Memory tests done at home
- Tracking sleep with devices worn on the wrist
- Video calls with doctors for check-ups
- Special brain scans (for some people)
These results are important for how studies trying to stop dementia will be planned in the future. Doing studies from home or partly from home helps scientists include more kinds of people from more places. It also costs less and helps people stay in the study. And this fits with how healthcare is changing, using more video calls and online tools, especially for older people.
Why the Results Are Still Promising — But We Need to Be Careful
It’s really important to know that studies like this are built to figure out how to do a bigger study, not to say for sure if a treatment works. Just because they didn’t see big results doesn’t mean melatonin doesn’t work for dementia. It just means this study wasn’t set up to find changes that happen over a long time or are small.
Also, the people in this study were pretty healthy and had good schooling. This means the results might not apply to everyone. Future studies will need to include more different kinds of people – like those with less schooling, different racial backgrounds, and other health problems. This will help the findings apply to more people.
So, you have to be careful when you look at the fact they didn’t see a clear benefit. A bigger, better study – with more people and over a longer time – could easily show something different.
Who Might Get Help from Longer, Bigger Studies?
Future studies need to figure out which groups of people are most likely to get help from taking melatonin. One group that looks good includes older people who have memory problems and a lot of trouble sleeping. These people might get two benefits: sleeping better and possible protection against brain swelling.
Also, maybe how well melatonin works depends on if you are male or female, your genes (like APOE-e4), or if you have other health issues (like heart problems or diabetes). Knowing these things will help doctors figure out who should take melatonin and how.
The people who planned the study say the next steps should include at least 200 people in each group. The study should last six to twelve months or more. And they should use ways to measure results that can spot smaller changes, like brain wave tests, combined scores from memory tests, and tracking sleep over a long time.
The Bigger Picture: Melatonin as One Tool
Don’t think of melatonin as a magic cure for Alzheimer’s or memory problems. But it could be a helpful extra part of a plan that uses different methods. Things like exercise, eating foods that fight swelling (like the Mediterranean diet), brain games, and getting good sleep are already known to help your brain stay healthy. Melatonin might make some of these things work even better by helping your sleep clock and reducing brain swelling.
It’s safe, cheap, easy to get, and simple to use. This makes melatonin look like a good extra tool in plans to prevent dementia – but only if bigger studies prove it works.
What Doctors Suggest Now and How Melatonin is Used
Right now, lots of adults of all ages use melatonin to help with sleep problems, especially trouble falling asleep or problems with their body clock. Doctors sometimes suggest doses from 0.5 mg up to 10 mg per day for sleep issues. This study used a much bigger dose – 25 mg – and people still seemed safe.
But there are no official guides saying melatonin should be used for memory problems or Alzheimer’s right now. If you’re thinking about taking melatonin to help your memory or slow down dementia, it’s really important to talk to a doctor first. This is extra true if you take other medicines, have other health problems, or have sleep issues.
Call for More Research: What Future Studies Need to Cover
To really see if melatonin can help stop dementia, future studies should have:
- More people, and from different backgrounds
- How long people take it should be 6 to 12 months or more
- Look at results based on sleep quality, genes, and other health issues
- Good ways to measure things in the brain and standard memory tests
- Ways to really measure sleep (like wrist devices or sleep studies)
These next steps will help show if melatonin does more than help you sleep. Maybe it can even protect your brain over time.
Be Curious, But Be Careful
This latest study doesn’t say clearly yes, take melatonin for memory problems or dementia. But it does show that it makes sense to keep studying this with bigger, better studies. And for older people looking for simple, safe ways to look after their brain health, melatonin might seem promising later on – but we need more clear information first.
It helps to keep up with new studies, ask smart questions, and be careful and informed about supplements. This can help people feel more sure as they get older.
Reference
Menczel Schrire, Z., Phillips, C. L., Duffy, S. L., Marshall, N. S., Mowszowski, L., La Monica, H. M., … & Hoyos, C. M. (2024). 3‐Month Melatonin Supplementation to Reduce Brain Oxidative Stress and Improve Sleep in Mild Cognitive Impairment: A Randomised Controlled Feasibility Trial. Journal of Pineal Research. https://doi.org/10.1111/jpi.70019
