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Morosil is a branded extract of the Sicilian Moro blood orange, found in weight-loss capsules and, more recently, memory supplements. So what are the real Morosil benefits, and how much is backed by human trials?
We searched PubMed for the studies on Morosil and Moro orange extract and summarised what they show on weight, waist size, dose, safety and drug interactions. We also checked for any memory evidence.
Morosil in Short
Morosil is a standardised dry extract of Moro blood orange juice, rich in anthocyanins (the red pigments), hydroxycinnamic acids and flavanones. Two placebo-controlled trials in overweight adults used 400 mg once a day and found modestly more weight and waist loss than placebo (about 2 kg extra on average). There are no published human trials of Morosil for memory or brain function. One case of acute liver failure in a Morosil user has been reported.
What Is Morosil?
Morosil is the trade name of a standardised extract made from the juice of the “Moro” blood orange (Citrus sinensis (L.) Osbeck, cultivar Moro), grown around Mount Etna in eastern Sicily. It is supplied by Bionap S.R.L., an Italian company near Catania, and is often labelled simply “Moro orange extract”.
Moro is a sweet orange, not a grapefruit or a bitter (Seville) orange. Its deep red juice is rich in anthocyanins (mainly cyanidin-3-glucoside), hydroxycinnamic acids, flavone glycosides, flavanones and vitamin C. Standardisation means each batch has a set level of these compounds.
Morosil Benefits: What the Research Says
The main evidence, from human trials down to animal and cell studies:
| Study | Who and what | Main result |
|---|---|---|
| Cardile et al., 2015 | Overweight healthy adults (60 according to the 2022 paper), Morosil 400 mg/day vs placebo for 12 weeks | Lower BMI from week 4; body weight, BMI, waist and hip size differed significantly from placebo |
| Briskey et al., 2022 | 180 overweight adults aged 20-65 randomised (98 finished), 400 mg once daily for 6 months, with diet and walking advice | Weight loss 4.2% vs 2.2%; waist down 3.9 cm vs 1.7 cm; less fat mass, visceral and subcutaneous fat; liver safety markers normal |
| Campos et al., 2026 (meta-analysis) | 3 randomised trials, 252 overweight or obese adults | About 2.1 kg more weight loss and 1.5 kg more fat loss than placebo; waist result borderline and very inconsistent; no change in lean mass |
| Titta et al., 2010 | Mice on a high-fat diet drinking Moro or Navelina (blond) orange juice for 12 weeks | Moro juice, but not blond orange juice, reduced weight gain and fat build-up |
| Salamone et al., 2012 | Mice on a high-fat diet given Moro juice for 12 weeks | Less weight gain, better insulin sensitivity, lower blood fats and less fatty liver |
1. Weight loss
This is Morosil’s main use. The 2015 trial gave overweight volunteers 400 mg a day for 12 weeks and reported lower weight and BMI than placebo, though the abstract does not give the size of the effect.
The larger six-month trial in Australia asked everyone to follow a calorie-controlled diet and walk three times a week. People taking Morosil lost 4.2% of their body weight versus 2.2% on placebo. But almost half of the 180 people randomised did not finish, and the study was funded by Bionap, the extract’s supplier.
A 2026 meta-analysis of three trials (252 people) found about 2.08 kg more weight loss and 1.53 kg more fat loss than placebo, with no effect on muscle mass. In plain terms: a real but small effect, seen alongside diet and exercise.
2. Waist size and belly fat
In the six-month trial, waist size dropped 3.9 cm versus 1.7 cm on placebo, with less deep belly (visceral) fat on scans. But in the meta-analysis the waist results varied widely between trials and the pooled result was only borderline.
3. Fatty liver and metabolism
In mice on a high-fat diet, Moro orange juice limited weight gain, improved insulin sensitivity and reduced fatty liver, and a 2025 rat study of a Moro orange extract found better blood sugar, cholesterol and inflammation markers. In lab dishes, Morosil also reduced fat build-up in developing fat cells. These are animal and cell results only; no human trial has tested Morosil for fatty liver or diabetes.
4. Memory and brain health: the “neural amplifier” claim
We searched PubMed for Morosil, Moro orange and blood orange with memory and cognition terms and found no human trials of Morosil or blood orange extract on memory or thinking. The closest evidence comes from ordinary orange juice: in a 2015 crossover trial, 37 healthy older adults who drank 500 ml a day of flavanone-rich orange juice for 8 weeks scored better on overall cognitive tests than after a low-flavanone drink. That was half a litre of juice, not a 400 mg capsule, so it is not proof that Morosil helps memory.
Phytomem One, a once-a-day memory tablet, lists Morosil (Moro red orange) among its 10 ingredients and presents it as a “neural amplifier”. It does not disclose how much Morosil each tablet contains, so we cannot tell whether it reaches the 400 mg used in the weight trials. We looked at the whole formula in our full Phytomem One review.
Morosil Dosage: How Much Should You Take?
| Studied dose | 400 mg once a day (both human trials) |
| When | In the morning with water after breakfast (2022 trial) |
| How long | 12 weeks to 6 months in trials |
| Other doses | Not tested in published human trials; the best dose is still unknown |
Products that hide how much Morosil they use cannot be compared with the trials. Do not take more than the label says.
Morosil Side Effects and Safety
In the six-month trial, two people on Morosil reported mild symptoms such as constipation, nausea or headache, versus five on placebo. Liver markers stayed normal in both groups.
However, a 2023 case report described a 37-year-old woman who needed a liver transplant for acute liver failure after taking Morosil for about a month. One case cannot prove cause, but stop and see a doctor if you notice yellow skin or eyes, dark urine or unusual tiredness.
Is it like grapefruit? Not in the same way. Grapefruit is a well-known blocker of the gut enzyme CYP3A4, which raises blood levels of many medicines. Blood orange is a sweet orange and, as a 2026 case report noted, has not been documented to have that effect. That report, though, described a kidney transplant patient whose tacrolimus levels jumped sixfold after about a litre of blood orange juice followed by grapefruit juice; causation was not confirmed. Seville (bitter) orange is the orange usually grouped with grapefruit. No interaction studies of Morosil itself exist.
Morosil Pros and Cons
👍 PROS
Human trials: two placebo-controlled weight trials and a 2026 meta-analysis.
Simple dose: one 400 mg capsule a day.
Standardised: consistent levels of anthocyanins and other polyphenols.
Well tolerated in trials: few, mild side effects over six months.
👎 CONS
Small effect: about 2 kg extra weight loss on average.
Maker-funded: the largest trial was paid for by the supplier, and many people dropped out.
No memory trials: brain claims are not supported by human studies.
Liver case report: one serious case of liver failure has been published.
Morosil FAQ
What is Morosil made from?
Morosil is a standardised dry extract of the juice of Moro blood oranges grown in Sicily. It is rich in anthocyanins, hydroxycinnamic acids and flavanones.
Does Morosil really help you lose weight?
Modestly. Two placebo-controlled trials found more weight and waist loss with 400 mg a day, and a 2026 meta-analysis found about 2 kg extra weight loss on average, mostly alongside diet and exercise.
How much Morosil should I take?
Both human trials used 400 mg once a day. In the larger trial it was taken in the morning with water after breakfast. Other doses have not been tested.
Does Morosil improve memory?
There is no human evidence for this. We found no published trials of Morosil or blood orange extract on memory or cognition. Calling it a neural amplifier is a marketing claim.
Does Moro orange extract interact with medication like grapefruit?
Blood orange is a sweet orange, not a grapefruit, and has not been shown to block CYP3A4 the way grapefruit does. One 2026 case report linked blood orange plus grapefruit juice to a sharp rise in tacrolimus levels, so people on transplant or other narrow-range drugs should ask their doctor first.
Is Morosil safe?
It was well tolerated in trials of up to six months, with normal liver markers. One case of acute liver failure in a Morosil user has been reported, so stop and see a doctor if you notice yellow skin, dark urine or unusual tiredness.
Scientific References
- Cardile V, Graziano AC, Venditti A. Clinical evaluation of Moro (Citrus sinensis (L.) Osbeck) orange juice supplementation for the weight management. Nat Prod Res. 2015. PMID 25588369
- Briskey D, Malfa GA, Rao A. Effectiveness of “Moro” blood orange standardized extract on weight loss in overweight but otherwise healthy men and women: a randomized double-blind placebo-controlled study. Nutrients. 2022. PMID 35276783
- Campos CM, et al. Effect of Moro orange juice extract supplementation in weight management in adults: a systematic review and meta-analysis. Nutr Health. 2026. PMID 40956687
- de Lima LP, de Paula Barbosa A. A review of the lipolytic effects and the reduction of abdominal fat from bioactive compounds and Moro orange extracts. Heliyon. 2021. PMID 34409177
- Titta L, et al. Blood orange juice inhibits fat accumulation in mice. Int J Obes (Lond). 2010. PMID 20029381
- Salamone F, et al. Moro orange juice prevents fatty liver in mice. World J Gastroenterol. 2012. PMID 22876038
- Tomasello B, et al. Anti-adipogenic and anti-oxidant effects of a standardised extract of Moro blood oranges during adipocyte differentiation of 3T3-L1 preadipocytes. Nat Prod Res. 2021. PMID 34414846
- Gomes Schmitt E, et al. Moro orange extract mitigates metabolic dysregulation, inflammation, oxidative stress and adipose tissue hyperplasia in obese rats. Int J Mol Sci. 2025. PMID 40565191
- Fernandes DP, et al. Acute liver failure secondary to anthocyanidin use: a case report. Transplant Proc. 2023. PMID 37183065
- Östman V, et al. Severe rise in tacrolimus levels following blood orange and grapefruit juice intake in a kidney transplant recipient: a case report. J Med Case Rep. 2026. PMID 42706579
- Kean RJ, et al. Chronic consumption of flavanone-rich orange juice is associated with cognitive benefits: an 8-wk randomized trial in healthy older adults. Am J Clin Nutr. 2015. PMID 25733635
Medical disclaimer: This article is for information only and is not medical advice. Statements about supplements have not been evaluated by the Food and Drug Administration. Supplements are not intended to diagnose, treat, cure or prevent any disease. Talk to your doctor before taking Morosil or any Moro orange extract, especially if you take medication, have liver disease, or are pregnant or breastfeeding.