The Centers for Disease Control and Prevention (CDC) estimates that roughly 59 percent of American adults have taken a dietary supplement within the past 30 days. For many, the over-the-counter capsules can be a seemingly harmless way to do everything from boost their immune system to help promote longevity. But just like any medication, taking a supplement can come with side effects—including causing nightmares. Read on to see which daily dose could be terrorizing your dreams.

RELATED: Doctors Reveal 5 Supplements They Recommend Most for Better Sleep.

High doses of melatonin could be causing your nightmares.

When trying to secure a good night’s sleep, many people turn to melatonin supplements, especially if they want to avoid prescription sleep aids. But according to doctors, one of the potential side effects of the bedtime dosage could be causing a different kind of disturbance while you snooze.

“If you go into your local drugstore, most melatonin products are five to 10 milligrams,” Whitney Roban, PhD, a clinical psychologist and sleep specialist, tells Inverse. “Anything over five milligrams has been shown to increase the likelihood of negative side effects like nausea, increased anxiety, and headaches. The side effects I hear about the most are very vivid dreams and nightmares.”

Why is this? Melatonin is a naturally occurring “sleep hormone” found in the body that regulates the cycles during the day when we feel tired or alert. Therefore, some doctors hypothesize that melatonin could cause people to fall into a deeper sleep—with some previous studies even finding that it can increase the amount of time in the REM stage where people are most likely to have nightmares.

“If you are spending more time in the stage of sleep where vivid dreams are most likely to occur, this may naturally lead to increases in bad/vivid dreams,” Michelle Drerup, PhD, a behavioral sleep medicine psychologist, tells Cleveland Clinic.

She explains that melatonin also releases a protein known as vasotocin that helps regulate REM sleep during the night. So, taking higher amounts of melatonin can increase vasotocin levels.

RELATED: 9 Melatonin Side Effects to Watch Out For, Doctors Say.

Studies have found that many melatonin supplements contain different dosages than advertised.

In a 2017 study published in the Journal of Clinical Sleep Medicine, researchers found that the melatonin dosage in supplements varied wildly from what was listed on the packaging, with some as much as 83 percent lower and others as much as 478 percent higher than advertised.

The results also showed that more than 71 percent of supplements tested were not within a ten percent margin of the listed dosage, and 26 percent were found to contain other ingredients such as serotonin. Even within the same production lots, the researchers found that the melatonin content in the product varied by as much as 465 percent.

Besides taking larger doses than necessary, some doctors also warn against taking the supplements for extended periods of time.

“Minimal research exists on using melatonin beyond a few months,” Drerup tells Cleveland Clinic. “In general, melatonin usage has only been deemed safe for up to three months, even though many people take it for much longer.”

If you believe your melatonin supplement is causing nightmares or if you’re having trouble sleeping, speak with your healthcare provider. And never begin taking a new supplement without first asking your doctor.

Green tea is often praised as a superdrink, loaded with antioxidants, metabolism-boosting catechins, and natural energy from caffeine. It’s marketed as a healthy go-to for weight loss, detox, and overall wellbeing. But despite its many benefits, green tea isn’t suitable for everyone. In some cases, it can do more harm than good, especially if consumed in excess or by people with certain health conditions such as anemia, pregnancy, or sensitive stomachs. From digestive irritation to nutrient interference and overstimulation, the side effects are real. Before adding green tea to your daily routine, here’s what you need to know about who should avoid it and why moderation is essential.

Green tea isn’t always as harmless as it seems: Why it may not suit everyone

Green tea contains caffeine, tannins, and catechins, natural compounds that can impact the body in both positive and negative ways. While caffeine provides a mild energy boost, it can also lead to restlessness, anxiety, and sleep problems in sensitive individuals. Tannins may irritate the stomach lining and interfere with the absorption of nutrients like iron. Catechins, though known for their antioxidant properties, can also reduce iron absorption and may affect liver health if consumed in large amounts. Additionally, drinking green tea on an empty stomach may intensify these effects. For most people, 2–3 cups a day is safe, but beyond that, these compounds can trigger unwanted side effects. People with anaemia, liver conditions, or caffeine sensitivity should consult a healthcare provider before increasing their green tea intake, especially if consuming concentrated extracts or supplements.

Common side effects of drinking too much green tea

Think twice before drinking green tea: 6 types of people who should avoid it

People with stomach sensitivity or acid reflux

Green tea increases the production of stomach acid due to the tannins it contains. This can lead to discomfort, bloating, constipation, or worsening of acid reflux and ulcers, especially when green tea is consumed on an empty stomach. Individuals with gastritis, peptic ulcers, or sensitive digestion should drink green tea only after meals or in between meals—not first thing in the morning.

People with iron deficiency or anaemia

Green tea may hinder the body’s ability to absorb non-heme iron, the kind found in plant-based foods, eggs, and dairy. For people already low in iron or diagnosed with anaemia, this effect can worsen symptoms. To reduce the impact, it’s best to drink green tea between meals instead of during them. Including vitamin C-rich foods like lemon or citrus fruits in the same meal can also help boost iron absorption.

Pregnant and breastfeeding women

During pregnancy and breastfeeding, consuming large amounts of green tea is not recommended. Green tea contains caffeine, which can increase the risk of miscarriage and affect the baby’s development if taken in excess. Catechins in green tea may interfere with folic acid absorption, while caffeine can pass into breast milk and overstimulate the infant. Experts recommend limiting intake to no more than 2 cups a day during these sensitive periods.

People sensitive to caffeine

If you are naturally sensitive to caffeine, even a small amount can trigger symptoms like restlessness, rapid heartbeat, irritability, or shakiness. High caffeine intake can also reduce calcium absorption, weakening bones over time. People with caffeine sensitivity should limit green tea to one cup a day or consider switching to a decaffeinated or herbal alternative.

Children

Green tea is not suitable for children. The caffeine content can overstimulate their nervous system, while tannins may block the absorption of key nutrients such as proteins and fats, which are vital for their growth and development. For these reasons, it’s best to avoid giving green tea to children.

People with certain health conditions

Green tea should be avoided or consumed with caution if you have certain medical conditions. It may worsen symptoms in those with anxiety disorders, bleeding disorders, heart rhythm problems, or diabetes. People with IBS or diarrhoea may find their symptoms worsen with green tea. It can also raise eye pressure in individuals with glaucoma and potentially worsen liver disease, especially when taken in the form of concentrated extracts. Those with osteoporosis should also be careful, as green tea may cause the body to lose calcium through urine.Green tea is a healthy beverage for many, but it’s not a one-size-fits-all remedy. While it contains antioxidants like catechins and offers benefits such as improved metabolism and heart health, it also comes with potential side effects. Caffeine and tannins in green tea can cause headaches, restlessness, and digestive issues and interfere with sleep, especially when consumed in large amounts or on an empty stomach. It may also reduce iron absorption and trigger acid reflux or nausea in some people.Moreover, green tea can sometimes interact negatively with stimulant medications like amphetamines, nicotine, and certain prescriptions, potentially overstimulating the heart or nervous system. It may also interfere with some blood pressure or anxiety medications if consumed in large quantities. To stay safe, stick to 2–3 cups a day, let your tea cool fully before drinking, and avoid taking it with iron-rich meals. If you’re pregnant, breastfeeding, or managing a serious medical condition, always consult your doctor. Like most health habits, moderation and mindfulness are key to enjoying green tea safely.Also Read: 8 everyday toxins that could be silently damaging your gut, liver, and hormones

Discover the best joint supplement for dogs designed to promote joint health, reduce arthritis symptoms, and improve mobility. Featuring carefully selected ingredients like glucosamine, chondroitin, MSM, and omega-3 fatty acids, these dog joint supplements can help your furry friend maintain active, pain-free joints and a better quality of life.

PITTSBURGH, PA / ACCESS Newswire / August 9, 2025 / Explore a wide range of top-rated joint supplements for dogs here.

Nutramax Laboratories Dasuquin with MSM Soft Chews for Large Dogs – Veterinary Recommended Joint Support

When it comes to veterinary medicine and canine joint health, Nutramax Laboratories Dasuquin with MSM Soft Chews stands out as the #1 veterinarian recommended joint health supplement brand. This advanced joint supplement for dogs combines glucosamine, chondroitin sulfate, and the anti-inflammatory benefits of methylsulfonylmethane (MSM), making it an effective dietary supplement to support cartilage and relieve joint pain associated with arthritis and osteoarthritis in dogs.

Dasuquin is specially formulated to help dogs maintain healthy joint function by protecting cartilage and reducing inflammation, which is beneficial for senior dogs, large dogs, or those diagnosed with canine hip dysplasia. The chewable soft texture makes it easy to administer, supporting compliance and consistent dosing.

If your dog may benefit from scientifically backed joint supplements that veterinary professionals trust, consider Nutramax Dasuquin with MSM Soft Chews to help improve your pet’s joint health and mobility.

Wuffes Advanced Dog Hip and Joint Supplement with Glucosamine, Chondroitin, Omega-3, MSM & Green Lipped Mussel – Powerful Joint Support for Small & Medium Breeds

Wuffes Advanced Dog Hip and Joint Supplement delivers a comprehensive blend of ingredients including glucosamine, chondroitin, omega-3 fatty acids, MSM, and green-lipped mussel – a natural source of anti-inflammatory omega-3s. This combination is designed to support joint cartilage, reduce arthralgia, and improve mobility for dogs suffering from joint pain or arthritis.

Ideal for small and medium dog breeds, these pork-flavored chews encourage daily use, which is essential for effective canine joint health maintenance. The inclusion of green-lipped mussel (Perna canaliculus) offers additional anti-inflammatory benefits, helping to promote comfort and reduce stiffness, especially in aging or active dogs.

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Nutramax Cosequin for Dogs Joint Health Supplement – Trusted Glucosamine and Chondroitin Support

Nutramax Cosequin is another exceptional joint health supplement for adult dogs that combines glucosamine, chondroitin sulfate, and MSM to support the repair and maintenance of joint cartilage and connective tissue. This chewable tablet is formulated to promote healthy joint function and ease signs of arthritis and osteoarthritis in dogs with joint pain or stiffness.

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VetIQ Glucosamine Hip & Joint Supplement – Chicken Flavored Soft Chews for Large & Small Breeds

If your dog enjoys tasty chews that also promote joint health, VetIQ Glucosamine Hip & Joint Supplement is an excellent choice. These chicken-flavored soft chews are packed with glucosamine, MSM, and krill oil, which provide anti-inflammatory omega-3 fatty acids to help reduce joint inflammation and support cartilage health.

Perfect for senior dogs or those who need extra joint support, these supplements help maintain joint function and ease symptoms of arthritis and hip dysplasia. The palatable formula encourages consistent use, enhancing pain relief and improving overall mobility for dogs coping with joint discomfort or stiffness.

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Zesty Paws Hip and Joint Supplement – Glucosamine, Chondroitin, MSM & Vitamins C & E for Large Breed Dogs

Zesty Paws Hip and Joint Supplement is a premium dietary supplement formulated for large breed dogs. It harnesses the joint-supporting power of glucosamine, chondroitin, MSM, and essential antioxidants such as vitamins C and E to enhance joint cartilage repair and reduce oxidative stress associated with arthritis and joint pain.

This bacon-flavored chewable supplement is designed to promote joint comfort, mobility, and overall canine joint health, making it ideal for dogs with osteoarthritis, hip dysplasia, or those simply needing extra joint support due to aging. The combination of ingredients provides anti-inflammatory effects and supports the structural integrity of joints.

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YuMOVE Hip & Joint Supplement – Scientifically Proven Advanced Strength Formula with ActivEase Green Lipped Mussel

YuMOVE Hip & Joint Supplement offers a scientifically proven solution to canine joint pain and arthritis. Using its patented ActivEase green-lipped mussel extract (Perna canaliculus), this advanced vet strength formula supports joint cartilage, reduces inflammation, and enhances joint mobility within six weeks of use.

Additionally, the formula includes glucosamine, omega-3 fatty acids, vitamin C, vitamin E, hyaluronic acid, and manganese to promote healthy joint function and combat the signs and symptoms of osteoarthritis in dogs. This comprehensive approach to canine joint health helps improve energy, reduces stiffness, and supports overall quality of life for dogs with joint challenges.

For dog owners seeking a powerful, vet-formulated joint supplement with proven efficacy, YuMOVE Hip & Joint Supplement is a highly recommended option.

Choosing the best joint supplement for dogs is essential to maintaining your pet’s mobility, comfort, and overall well-being. Each of these top-rated supplements offers unique benefits, from glucosamine and chondroitin support to anti-inflammatory omega-3 fatty acids and green-lipped mussel extracts. Investing in quality joint supplements can help dogs with arthritis, hip dysplasia, and joint pain enjoy an active, happy life.

Browse the best joint supplements for dogs today and give your canine companion the joint support they deserve.

MEDIA CONTACT

Adrienne Shaw
a.shaw@supplementprices.net

SOURCE: SupplementPrices.net

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L-Carnitine supplement and formula. (Photo by Danijela Maksimovic on Shutterstock)

Sport supplements are hard to get away from if you like to exercise regularly. Even if you’re not interested in them, there’s a good chance your gym will have posters extolling their virtues or your sporty friends will want to talk to you about them.

It can be hard to know what supplements to take as there is a lot of mixed information out there. L-carnitine is among the more controversial supplements. While there is evidence it supports muscle recovery and enhances exercise performance, research has also shown it can contribute to cardiovascular disease.

In a new study, my colleagues and I found it may be possible to counter the negative effects of l-cartinine by eating pomegranate with it.

First, it’s important to understand what l-carnitine is. Your body produces a small amount of l-carnitine naturally. This happens in the kidneys, liver and brain.

When l-carnitine was first identified in humans in 1952, it was thought to be a vitamin and it was referred to as vitamin BT. After years of research on this compound, l-carnitine is now considered a quasi-vitamin because for most people the human body can produce enough l-carnitine itself.

L-carnitine can be bought as a dietary supplement, but the nutrient is also added to energy drinks and some protein powders by manufacturers to try and enhance the value of their products. Manufacturers normally clearly state it on the product if it contains l-carnitine – it’s not something a company will try to hide.

Some foods naturally contain l-carnitine, such as meat and in tiny amounts in dairy products. L-carnitine is not fed to livestock but it is present in muscle tissue. L-carnitine was first found in meat in 1905. It is for this reason that the name carnitine is derived from the Latin word carnis, meaning “of the flesh.”

The Harmful Effects Of L-Carnitine Supplements

It is not thought to be intrinsically harmful. Your gut microbes are to blame for the risks associated with l-carnitine.

Less than 20% of l-carnitine supplements can be taken in by the human body. The unabsorbed l-carnitine travels down the gastrointestinal tract and reaches the colon. The colon is home to trillions of microbes, including bacteria, viruses and fungi.

When the remaining 80% of the l-carnitine supplement arrives in the colon, the microbes start absorbing the nutrient and they use it to produce something else: trimethylamine (TMA). TMA is a compound the human body can efficiently absorb, and that is where the potentially harmful effects of l-carnitine supplements arise.

Once the body absorbs TMA, it goes to the liver via the blood stream. The liver converts TMA to trimethylamine N-oxide (TMAO). Research has shown that high levels of TMAO in the blood can contribute to cardiovascular disease.

For example, a research group at the Cleveland Clinic in the U.S. gave human participants a nutrient similar to l-carnitine that is also converted into TMA by gut microbes. The researchers found that the nutrient caused an increased risk of thrombosis (blood clots) in their participants.

L-carnitine itself is a beneficial nutrient. When it is produced by our bodies, which happens in the kidneys, brain and liver, it’s not metabolized by the gut microbiota and isn’t converted to TMAO. Your body can absorb more l-carnitine from meat than from supplements, which makes it less harmful as that means less of it ends up in the colon.

Dietary Intervention Can Reduce Harmful Effects

In my team’s lab at the Quadram Institute in Norwich, England, we simulated what happens when the l-carnitine supplement reaches the microbes in the colon. We fed a culture of gut microbes with l-carnitine and measured the TMA that the microbes produced.

Then, we fed a culture of gut microbes with l-carnitine together with a pomegranate extract, which is rich in polyphenols. Polyphenols are plant compounds with antioxidant, antimicrobial, and anti-inflammatory properties that may help keep you healthy and protect you against diseases.

The main polyphenols in pomegranate belong to a group called ellagitannins, a type of polyphenol that can reach the colon almost entirely intact, where they can interact with the gut microbiota. When we measured the TMA that the gut microbes produced in the second experiment, we saw much less TMA.

Our experiments in the lab show that a polyphenol-rich pomegranate extract can reduce microbial TMA production and eliminate the potentially harmful effects of l-carnitine supplements.

Our laboratory experiments showed that the pomegranate extract can reduce the production of TMA. Ellagitannins are also abundant in other fruits and nuts, such as raspberries and walnuts. So, if you take l-carnitine supplements, our research suggests that it may be a good idea to include ellagitannin-rich foods in your diet. Eating more fruits and nuts can be good for your health, so including these in your diet will probably be beneficial anyway.

Our group is now moving the science outside of the lab. We are testing in human participants how effective the pomegranate extract is at reducing TMAO production from l-carnitine supplements. This study will tell us whether taking an l-carnitine supplement along with a pomegranate extract may be better than taking the supplement on its own.

Julia Haarhuis, PhD student – Food, Microbiomes and Health, Quadram Institute. She works at the Quadram Institute and receives funding from the Wellcome Trust.

This article is republished from The Conversation under a Creative Commons license. Read the original article.