Relaxium Sleep is generally safe for most healthy adults in the short term, but it carries real considerations depending on your health status, age, and medications. It’s a dietary supplement, not an FDA-approved drug, which means it hasn’t gone through the rigorous safety testing required of prescription sleep aids. Each of its eight active ingredients has its own safety profile, and combining them creates a mix that hasn’t been well studied as a whole formula.
What’s Actually in Relaxium Sleep
A two-capsule serving of Relaxium Sleep contains: 500 mg of L-tryptophan, 228.9 mg of a proprietary blend of valerian root and hops extracts, 125 mg of ashwagandha extract, 100 mg of magnesium, 100 mg of GABA, 75 mg of chamomile, 75 mg of passionflower extract, and 5 mg of melatonin.
Most of these ingredients are common in sleep supplements and have long histories of use in herbal medicine. The amounts are within typical supplemental ranges, though the 5 mg melatonin dose is on the higher end. Your body naturally produces melatonin in much smaller quantities, and many sleep researchers suggest starting at 0.5 to 1 mg. There isn’t enough data on higher-dose melatonin supplements to have a clear picture of their long-term safety, according to the National Center for Complementary and Integrative Health.
Common Side Effects
The individual ingredients in Relaxium Sleep can cause drowsiness, dizziness, headache, nausea, dry mouth, and digestive issues like diarrhea or stomach upset. These are the most frequently reported side effects across sleep supplements containing these compounds. Because Relaxium combines multiple sedating ingredients (melatonin, valerian, passionflower, L-tryptophan, GABA, and chamomile), the drowsiness effect can stack, potentially leaving you groggy or mentally foggy the next morning.
Melatonin tends to stay active longer in older adults, which increases the risk of daytime drowsiness in that group. L-tryptophan can also cause drowsiness and dizziness, and ashwagandha preparations sometimes trigger stomach upset, diarrhea, or vomiting.
Who Should Avoid It
Several groups should steer clear of Relaxium Sleep or talk with a doctor first. Ashwagandha should be avoided during pregnancy and breastfeeding. It’s also not recommended for people with autoimmune disorders, thyroid conditions, or hormone-sensitive prostate cancer, since it can increase testosterone levels. If you’re scheduled for surgery, ashwagandha should be stopped beforehand.
One case study linked maternal melatonin use during breastfeeding to bleeding episodes in an infant, which resolved after the mother stopped taking it. While broader research on melatonin in pregnancy hasn’t flagged major safety concerns, the combination of melatonin with ashwagandha and several other herbal ingredients makes Relaxium a poor choice during pregnancy or nursing.
L-tryptophan carries specific precautions for people with diabetes, a history of bladder cancer, or certain digestive conditions. It may also increase the risk of cataract formation with excessive UV exposure.
Drug Interactions to Watch For
This is where Relaxium Sleep demands the most caution. Its ingredients interact with a surprisingly wide range of medications.
- Blood thinners: Melatonin combined with anticoagulant or anti-platelet drugs may increase bleeding risk.
- Blood pressure medications: Both melatonin and ashwagandha can affect blood pressure, potentially interfering with these drugs.
- Sedatives and anti-anxiety medications: Combining Relaxium’s sedating ingredients with prescription sedatives can produce excessive drowsiness.
- Anti-seizure medications: Melatonin may reduce the effectiveness of anticonvulsants and increase seizure frequency.
- Immunosuppressants: Both melatonin and ashwagandha can stimulate immune function, working against these drugs.
- Thyroid medications: Ashwagandha may interfere with thyroid hormone levels.
- Diabetes medications: Both ashwagandha and L-tryptophan can affect blood sugar.
- Antidepressants (especially MAOIs and fluvoxamine): L-tryptophan should not be combined with MAO inhibitors. It raises serotonin levels, and combining it with certain antidepressants can cause a dangerous condition marked by agitation, confusion, fever, rapid heart rate, and trembling. Fluvoxamine specifically can cause melatonin levels to spike, leading to excessive drowsiness.
- Birth control pills: Hormonal contraceptives used alongside melatonin may increase sedation and melatonin side effects.
If you take any prescription medication, the number of potential interaction points across eight active ingredients is high enough that a pharmacist review is worthwhile before starting Relaxium.
The FDA Warning Letter
In April 2025, the FDA issued a warning letter to American Behavioral Research Institute, the company behind Relaxium Sleep’s clinical research. The agency found that the company conducted a clinical trial on Relaxium’s effects on insomnia without first submitting an Investigational New Drug application, which is required when studying a product’s ability to treat a medical condition. The FDA stated this “raises significant concerns about the safety and welfare of enrolled subjects” and “raises concerns about the validity and integrity of the data collected.”
This matters because much of Relaxium’s marketing rests on claims of clinical testing. The FDA’s letter suggests that the trial data supporting those claims may not meet the standards required for legitimate clinical research. It doesn’t mean the product is dangerous, but it does undermine the company’s own safety and efficacy evidence.
What “Dietary Supplement” Means for Safety
Relaxium Sleep is sold as a dietary supplement, which means the FDA does not review it for safety or effectiveness before it hits store shelves. The manufacturer is responsible for ensuring the product is safe, but there’s no independent verification required. This is the regulatory framework for all supplements, not just Relaxium, but it means you’re relying on the company’s quality controls rather than government oversight.
The lack of pre-market review also means the specific combination of all eight ingredients at these doses has never been formally evaluated for safety as a formula. Each ingredient may be reasonably well studied on its own, but the interaction effects between them, taken together every night, are largely unknown. For short-term, occasional use by a healthy adult who isn’t on medications, Relaxium Sleep is unlikely to cause serious harm. The risk profile changes meaningfully if you have chronic health conditions, take prescription drugs, or plan to use it long term.