Logan Steele
Melatonin is generally safe for short-term use in most adults, but like all medicines, it can cause side effects. While muscle aches are not listed as a common side effect, melatonin has been known to cause other issues such as headaches, sleepiness, dizziness, and nausea. Melatonin may also cause an allergic reaction in rare cases, and it can have adverse effects when taken in high doses or for extended periods. It is important to consult a doctor if any side effects occur, and to discontinue use if they persist.
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What You'll Learn
Melatonin's anti-inflammatory and antioxidant properties
Melatonin is a hormone responsible for regulating the circadian rhythm in humans. It is mainly secreted by the pineal gland in the dark. Melatonin has high cell permeability and can easily cross both the blood-brain and placenta barriers. It also has antioxidant and anti-inflammatory properties.
The anti-inflammatory effects of melatonin are achieved mainly by inhibiting inflammasome activation. Melatonin also prevents the translocation of nuclear factor-kappa B (NF-κB) to the nucleus to bind to DNA. This prevents the upregulation of the transcription and translation of inflammatory cytokines, including interleukin (IL)-1, IL-6, and tumor necrosis factor (TNF). Melatonin is also capable of downregulating the expression of 5-lipoxygenase, a key player in inflammation activation.
The antioxidant properties of melatonin are evident in its ability to protect against oxidative stress. Melatonin improves mitochondrial function, stimulates the expression of, and activates antioxidant enzymes, including catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GPx). The hydrophilic and lipophilic properties of melatonin allow it to easily transfer through all bio-barriers, making it highly available in subcellular organelles such as cell membranes and mitochondria.
Research has shown that melatonin can be beneficial in treating respiratory distress syndrome in preterm newborns. Its anti-inflammatory and antioxidant properties have been found to improve clinical parameters in patients with chronic periodontitis. Additionally, melatonin's ability to activate brown adipose tissue and increase energy expenditure has been observed.
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Melatonin's effect on mitochondrial shape and function
Melatonin has been found to have a significant influence on mitochondrial shape and function. It is well-known that melatonin promotes sleep and regulates the circadian clock, but its effects on mitochondria are also notable. Mitochondria, being the powerhouse of the body, play a crucial role in synthesizing ATP through oxidative phosphorylation, and melatonin has been detected in this organelle.
One of the key ways melatonin influences mitochondrial shape is by reshaping the mitochondrial network. In hippocampal HT22 cells exposed to ischemic-like injury, melatonin treatment resulted in mitochondria conserving elongated tubular shapes and straight, parallel cristae, compared to the control condition. This preservation of normal mitochondrial shape is essential for their function and survival. Additionally, melatonin has been found to promote intercellular mitochondrial transfer via tunneling nanotubes (TNT) after ischemic-like injuries, further supporting mitochondrial function.
Melatonin also plays a protective role in mitochondria. It acts as a free radical scavenger and a potent antioxidant, protecting mitochondria from oxidative damage. Melatonin enhances autophagy at different phases to shield mitochondria from oxidative harm. Furthermore, melatonin's interaction with uncoupling proteins (UCPs) helps balance the mitochondrial membrane potential (Δψ), accelerate electron transport, and reduce ROS formation and cellular oxidative damage. These protective effects are especially important in pathological conditions and cancer cells.
In cancer cells, melatonin reprograms glucose metabolism to resemble that of normal cells. It allows the conversion of pyruvate to acetyl-CoA in mitochondria, which is critical for the citric acid cycle and optimal ATP production. Additionally, melatonin's presence in mitochondria may contribute to its synthesis, ensuring a continuous supply. Overall, melatonin's effects on mitochondrial shape and function highlight its potential as a therapeutic agent and biomarker in various physiological and pathological contexts.
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Melatonin overdose
Melatonin is a hormone produced by the body to aid sleep at night. It is also available as an over-the-counter dietary supplement for adults and children in the form of pills, creams, gargles, or gels. While melatonin is considered to be one of the least toxic medications, an overdose is possible and can lead to unwanted side effects.
If you suspect a melatonin overdose, call your doctor, 911, or poison control right away. Melatonin overdose symptoms include drowsiness, dizziness, fatigue, headache, confusion, nightmares, hypotension, tachycardia, and hypothermia. In rare cases, an overdose may also result in an allergic reaction, with symptoms such as a skin rash, swollen lips, mouth, throat, or tongue, and breathing difficulties. Older individuals may be more sensitive to melatonin and may experience prolonged active periods of the supplement in their bodies, leading to increased sleepiness the following day.
Additionally, melatonin interacts with certain medications, especially those related to the cardiovascular, dermatological, and central nervous systems. It is crucial to consult a doctor before starting melatonin supplements to ensure safe usage and avoid potential adverse effects.
To prevent a melatonin overdose, it is important to follow the recommended dosage instructions and purchase reputable supplements. The safety and efficacy of supplements are not closely monitored by the U.S. Food and Drug Administration (FDA), so buyers should exercise caution when selecting a product.
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Melatonin's effect on daytime sleepiness
Melatonin is a popular sleep aid, with around 3 million Americans using it as of 2012. While it can be helpful for certain sleep issues, it is not a treatment for other sleep disorders, including obstructive sleep apnea.
One of the side effects of melatonin is daytime sleepiness. The sleep-inducing effects of melatonin can continue into the day, resulting in tiredness. This is more likely to occur in older people, as melatonin can remain active in the body for longer in older adults. However, adverse reactions to melatonin are generally rare in adults and tend to occur with higher doses or supplements designed for extended release.
Other common side effects of melatonin include headaches and dizziness. In rare cases, people may experience a serious allergic reaction (anaphylaxis) to melatonin, with symptoms such as swelling of the lips, mouth, throat, or tongue, breathing difficulties, skin discolouration, and confusion.
It is important to consult a doctor if any side effects persist and to discontinue use if necessary. To reduce the risk of adverse effects, it is recommended to purchase reputable supplements and consult a doctor about dosage and timing.
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Melatonin's effect on muscle metabolism and strength
Melatonin is a naturally occurring hormone that helps regulate sleep and wake cycles. In addition to its sleep-promoting effects, melatonin has been found to have a positive impact on muscle metabolism and strength.
Research suggests that melatonin can improve muscle metabolism by increasing the body's ability to burn fat and regulate glucose. In one study, participants who took melatonin supplements experienced a decrease in body fat and an increase in lean muscle mass compared to those who took a placebo. Melatonin has also been shown to increase adiponectin levels, which is beneficial for fat oxidation and can improve metabolic processes.
Additionally, melatonin has been linked to improved muscle strength. In elderly individuals, higher levels of urinary melatonin were associated with increased grip and quadriceps strength. Furthermore, in preclinical models of Duchenne muscular dystrophy (DMD), a genetic disorder characterised by muscle atrophy, melatonin administration improved muscle metabolism and strength by enhancing antioxidant capacity and promoting effective muscle contraction.
The effects of melatonin on muscle strength may also be influenced by age and hormonal changes. For example, in postmenopausal women, a decrease in urinary melatonin levels was correlated with sarcopenia, a condition characterised by muscle loss. Similarly, in castrated male rats, melatonin supplementation slowed muscle atrophy by acting as a testosterone substitute.
While melatonin can have beneficial effects on muscle metabolism and strength, it is important to note that individual results may vary. The effects of melatonin can be influenced by factors such as age, dosage, and underlying health conditions. As with any supplement or medication, it is always recommended to consult with a healthcare professional before taking melatonin to ensure safe and effective use.
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Frequently asked questions
There is no evidence to suggest that melatonin causes muscle aches. In fact, melatonin has been shown to improve mitochondrial shape and function in muscles, and can even help treat skeletal muscle disorders.
Side effects of melatonin include headache, sleepiness, dizziness, and nausea. In rare cases, an allergic reaction may occur, indicated by swelling of the lips, mouth, throat, or tongue, or breathing difficulties.
If you experience any side effects, stop taking melatonin and consult your doctor. You can also report side effects using the Yellow Card safety scheme.
You should not drive or use machinery for 4-5 hours after taking melatonin, as it may cause dizziness and sleepiness.
Caffeine can increase or decrease melatonin levels in the body, so it is recommended to consult your doctor before combining the two.
