Moon Juice Review 2026: Better Formulated Than Its Reputation, Missing One Warning

Sleepy Magnesi-Om contains **0.3 mg of melatonin**. That number looks like a mistake next to a market where 5 mg and 10 mg gummies are standard and 12 mg is sold as "extra strength." It is not a mistake. It is the dose the research actually supports, and almost nobody uses it. Melatonin is a hormone, not a sedative, and the goal is to restore nighttime plasma melatonin to the level a healthy young adult produces naturally. **A dose of about 0.3 mg does exactly that.** Work led by Richard Wurtman at MIT compared doses directly: the physiological 0.3 mg dose restored sleep efficiency and raised plasma melatonin to normal levels. The pharmacological 3.0 mg dose also improved sleep — but it **induced hypothermia and left plasma melatonin elevated into the daylight hours**, which is the opposite of what a sleep hormone should be doing at 11am. Worse, there is evidence that supraphysiological concentrations can **desensitise melatonin receptors**, which means that over time a large dose can make melatonin work less well. The maximally effective range identified in that research was 0.3–1 mg. So the standard 5 mg gummy is roughly 17 times the physiological dose, and the mechanism by which it may stop working is built into taking it. Moon Juice put 0.3 mg in the bottle. In months of reading supplement labels, that is the clearest example we have found of a brand choosing the evidence over the marketing instinct — because "0.3 mg" is a much harder number to sell than "10 mg."

Magnesi-Om is Moon Juice's bestseller, and the formulation is sound. Here is the range with the doses the brand publishes.

**310 mg of elemental magnesium** in Magnesi-Om is a real dose — the RDA is 310–420 mg for adults, so one serving covers most of a day's requirement. The forms are chelates and organic salts rather than magnesium oxide, which is the cheap, poorly absorbed form that fills most drugstore products. **112 mg of L-theanine** sits inside the 100–200 mg range used in trials for calm and attention. Also a real dose. **And Moon Juice is honest about how the "regularity" claim works.** Its own copy says "Magnesium Citrate supports regular bowel movements." Magnesium citrate is an osmotic laxative — that is the mechanism, and saying so plainly is better than the vague "supports digestive comfort" language most brands would reach for. If you are sensitive, that is also your warning: this product will loosen things up, by design. **Neuro Magnesi-Om at $74 is the weakest of the three.** The 2 g of Magtein magnesium L-threonate matches the dose used in the trials on that branded ingredient, which is correct. The 50 mg caffeine with 100 mg L-theanine is a sensible pairing. But the **200 mg of lion's mane is a token amount** — the main human cognition trial on lion's mane used **3,000 mg per day**, and the Alzheimer's Drug Discovery Foundation describes the cognitive evidence as mixed even at full dose. Two hundred milligrams is roughly a fifteenth of that. It is on the label to be on the label.

This is the finding we would most want a Moon Juice customer to have, and it is not on any product page we read. **Ashwagandha appears across the range.** SuperYou contains 250 mg. SuperHair contains 273 mg as KSM-66. Sex Dust contains it in a blend. And Moon Juice sells these as **stacks** — the Cortisol Control Stack, the Good Head Stack, Amanda's Stash at $359 — which means a customer following the brand's own recommendations can be taking ashwagandha from two or three products at once without ever adding up the total. Ashwagandha has an emerging liver safety signal that has moved regulators: **The NIH's LiverTox database classifies ashwagandha as a probable cause of clinically apparent liver injury**, with a likelihood score of C. A systematic review identified **37 published cases** of ashwagandha-induced liver injury, with the number rising since the first was documented in 2017. Injury typically presents **2 to 12 weeks after starting**, usually with a cholestatic or mixed pattern, jaundice and itching. **Denmark banned ashwagandha in April 2023**, the first European country to do so, citing liver toxicity, thyroid effects and possible abortifacient activity. **Australia's Therapeutic Goods Administration** received 12 reports of liver problems up to February 2024, seven with enough detail to suggest ashwagandha as the cause. In **June 2024 an EU working group recommended prioritising ashwagandha for an Article 8 safety procedure**. **Germany's Federal Institute for Risk Assessment** advises that children, pregnant and breastfeeding women, and people with liver disease avoid it. We want to be even-handed, because the picture is genuinely contested. **Clinical trials of ashwagandha have not reported serum enzyme elevations or hepatotoxicity**, and researchers and industry bodies have pushed back hard on the regulatory actions, arguing the case reports involve confounding and poor product quality. Thirty-seven cases against very large global consumption is a low absolute rate. This is an idiosyncratic reaction, not a dose-dependent poison. But a low-probability, serious, idiosyncratic reaction with a recognisable presentation is precisely the kind of thing a customer should be told to watch for — especially one taking it daily, from multiple products, for months.

SuperHair ($66, four capsules daily) is one of Moon Juice's most popular products and one of its most crowded. Per its own listing it contains **273 mg organic ashwagandha (KSM-66), 250 mg wildcrafted saw palmetto, 75 mcg iodine from kelp, 110 mg horsetail**, plus a full multivitamin including vitamin A as palmitate, biotin, iron as bisglycinate, folate as Metafolin, methylcobalamin, and vitamin K2 as MK-7. Several of those are quality choices — **KSM-66 is a branded, standardised ashwagandha extract with actual trials behind it**, and naming it on the label rather than saying "ashwagandha extract" is exactly right. Metafolin, methylcobalamin and iron bisglycinate are all the better forms. Four things to check against your own situation before taking four capsules of this every day: **Iodine.** 75 mcg from kelp is a modest dose, but if you have Hashimoto's, Graves', a nodular goitre or take levothyroxine, iodine can destabilise thyroid function. Ask before starting. **Saw palmetto.** 250 mg. Saw palmetto has been associated with lowered PSA readings, which matters if you are a man of screening age — tell your doctor you take it before a PSA test so the result can be interpreted correctly. **Biotin.** The amount is not stated in the summary, but biotin at high doses interferes with immunoassays and can produce **falsely low troponin results**, which the FDA has warned about and linked to a patient death. Tell anyone ordering your bloodwork. **Iron.** Iron in a daily supplement is only appropriate if you need it. Get a ferritin test rather than assuming — unnecessary iron is one of the few supplements that is actively harmful rather than merely wasteful, particularly with undiagnosed haemochromatosis. **And vitamin A as palmitate** is preformed retinol. In a product taken daily and long-term, and particularly in pregnancy, the total across all your supplements is worth adding up.

Sex Dust ($38) is the product that defines Moon Juice's public image, and it is fair to say it earned the scepticism. Its blend — shatavari, maca, ginseng, eleuthero, astragalus, ashwagandha, rhodiola, schisandra — is a traditional-use adaptogen stack, and the evidence that any of it improves what the name implies is not there. That said, two things are worth stating fairly. The ingredients are named individually rather than buried in an unlabelled proprietary blend. And the clinical evidence for adaptogens generally is limited rather than absent — some, like rhodiola for fatigue and ashwagandha for perceived stress, have modest trial support at doses that matter. **Which is where the "potently dosed" claim runs into trouble.** SuperYou contains **250 mg of ashwagandha**; the KSM-66 and Sensoril trials generally use **300–600 mg**. Its **150 mg of rhodiola** is at the bottom of the 100–600 mg studied range. These are not fractional doses of the kind we have found elsewhere — they are close, and defensible — but "potently dosed" implies at or above the studied amount, and on ashwagandha specifically it is under. If you are buying Moon Juice, our honest read is that the value sits in the **magnesium line**, where the doses are right and the mechanisms are established. The Dusts are a more expensive way to buy adaptogens whose evidence is thin at any dose.

Moon Juice's stated testing programme is comprehensive: **"We go above and beyond to 3rd party test for bio-identity, purity, potency, microbiological content, residual solvents, heavy metals, and pesticides. Our supplements are made in GMP-Certified facilities."** Seven test categories including residual solvents and pesticides is a broader panel than most brands describe. The caveat is the familiar one: we found the claim, not the results. We could not locate a published certificate-of-analysis directory or lot-specific reports. That is a claim about process rather than a document you can read, and for a brand built on adaptogens — botanicals where identity testing genuinely matters, because substitution and adulteration are real problems in that supply chain — publishing the results would convert a good claim into a verifiable one. The prices are steep:

**Moon Juice is worth it if:** you want the magnesium line specifically — Magnesi-Om and Sleepy Magnesi-Om are well-formulated, correctly dosed products and the 0.3 mg melatonin is genuinely better than what almost anyone else sells; you value named branded extracts like KSM-66 and Magtein at their studied doses; you want full ingredient disclosure with milligram amounts; and the price is comfortable. **Look elsewhere if:** you have any liver condition, are pregnant or breastfeeding, or would be taking ashwagandha from more than one product — the liver signal is low-probability but real and unwarned here; you are buying Neuro Magnesi-Om for the lion's mane, which is at a fifteenth of the trial dose; you want published certificates of analysis rather than a testing claim; you are buying the Dusts expecting the effects their names imply; or you would rather buy magnesium glycinate and L-theanine separately for a fraction of the cost, which is a completely reasonable choice. **One general note on stacks.** Moon Juice merchandises heavily in bundles, up to $359. Bundles are how people end up taking overlapping ingredients without noticing — ashwagandha in two products, magnesium in two products, iodine in one they forgot about. If you buy a stack, lay the labels side by side and add up the shared ingredients before you start.

**Is Magnesi-Om any good?** Yes. 310 mg of elemental magnesium from chelates and organic salts, plus 112 mg of L-theanine, is a properly dosed product in well-absorbed forms. Moon Juice is also honest that the "regularity" effect comes from magnesium citrate acting as an osmotic laxative. **Why does Sleepy Magnesi-Om only have 0.3 mg of melatonin?** Because that is the dose the evidence supports. Roughly 0.3 mg restores plasma melatonin to normal nighttime levels; the 3 mg and higher doses common on shelves have been shown to cause hypothermia and to leave melatonin elevated into the following day, and supraphysiological levels may desensitise melatonin receptors. It is the best formulation decision in this catalogue. **Is ashwagandha safe?** For most people, yes — but it carries a real, if uncommon, liver injury signal. LiverTox classifies it as a probable cause of clinically apparent liver injury, a systematic review found 37 published cases, Denmark banned it in 2023 and Australia's TGA has logged reports. Injury typically appears 2–12 weeks in with jaundice and itching. Clinical trials have not shown liver enzyme problems, so the picture is contested. Avoid it in pregnancy, breastfeeding, liver disease and children, and stop if you develop jaundice or dark urine. **Does Sex Dust work?** There is no good evidence that it does what the name implies. It is a traditional-use adaptogen blend with individually named ingredients, which is better than an unlabelled proprietary blend, but the evidence base for the claim is not there. **Are Moon Juice products third-party tested?** The company states it third-party tests for bio-identity, purity, potency, microbiological content, residual solvents, heavy metals and pesticides, in GMP-certified facilities. That is a comprehensive claim. We could not find published certificates of analysis, so we report it as a claim rather than a verified result. **Is Moon Juice's "potently dosed" claim accurate?** Partly. Magnesium at 310 mg, L-theanine at 112 mg, Magtein at 2 g and melatonin at 0.3 mg are all correct doses. But SuperYou's ashwagandha at 250 mg sits below the 300–600 mg used in trials, and Neuro Magnesi-Om's lion's mane at 200 mg is a fraction of the 3,000 mg used in the main cognition study. **What's the best thing to buy from Moon Juice?** Magnesi-Om or Sleepy Magnesi-Om. Those are the products where the formulation genuinely justifies the purchase. **Can I take Magnesi-Om with another magnesium supplement?** Add the totals first. The tolerable upper intake for supplemental magnesium is 350 mg daily, and Magnesi-Om alone provides 310 mg. Going over mostly causes diarrhoea and cramping rather than serious harm, but it is easily done by accident.