Written by Shereen, Product Management Associate · Updated 6 November 2026
Do The Purest Co slimming drinks have side effects?
Our slimming drinks list full ingredients and key doses, and publish their lab reports. Sicilian Orange Slimming Elixir and Grapefruit & Kombucha Slimming Blend were screened for weight-loss drugs and laxatives, with none detected. In trials of their headline ingredients, liver safety markers stayed normal. If you're pregnant, breastfeeding or on medication, check with your doctor first.
This article is for you if: you're thinking about Sicilian Orange Slimming Elixir, Night Burn Saffron Elixir or Grapefruit & Kombucha Slimming Blend, and want to know exactly what's inside, what the research and our lab tests show, and whether they suit you.
Checking for side effects before you buy a slimming drink is a smart move. Singapore's Health Sciences Authority (HSA) has found a banned weight-loss drug and laxatives in slimming products sold online, some of them labelled "all-natural".[1] So the useful questions are what's really in the drink, what research on those ingredients found, and who should check with a doctor first. Here are the answers for each of our slimming drinks.
→ See Sicilian Orange Slimming Elixir, our daily blood orange drink for weight management
In this article
What's inside each Purest Co slimming drink?
Each drink lists its full ingredients on the pack and product page, with the amount of every key ingredient per serving. Here's how they compare.
| Drink | Key ingredients per serving | Caffeine | Sugar per serving |
|---|---|---|---|
| Sicilian Orange Slimming Elixir (30 g sachet) | 400 mg Morosil® Sicilian blood orange extract, 500 mg L-carnitine, 10 billion postbiotic cells of Bifidobacterium lactis CECT 8145, 3 mg Coleus forskohlii extract, 3,000 mg Fibersol®-2 prebiotic fibre | No caffeine-containing ingredients | 3 g, with no added sugar |
| Sicilian Orange Slimming Elixir Zero (30 g sachet) | The same key ingredients, in the same amounts | No caffeine-containing ingredients | 0 g |
| Night Burn Saffron Elixir (30 g sachet) | 30 mg SAFR'INSIDE™ saffron extract, 200 mg Okralin™ okra extract, 100 mg lemon verbena extract, 500 mg L-carnitine, plus L-tryptophan | Caffeine-free | 0 g |
| Grapefruit & Kombucha Slimming Blend (12 g scoop) | 630 mg Sinetrol® Xpur (grapefruit, orange and guarana extracts), 500 mg L-arabinose, 400 mg konjac, 50 mg kombucha powder, 7,000 mg isomalto-oligosaccharide prebiotic fibre | 22 mg natural caffeine | 0.8 g |
Sources: our product guide, product pages and product information sheets, checked 4 November 2026.
A few notes for allergies and diets:
- Sicilian Orange Slimming Elixir is free from dairy, gluten, soy and nuts, with no artificial colours or preservatives. It is halal-certified by the Taiwan Halal Integrity Development Association.[10]
- Sicilian Orange Slimming Elixir Zero has 0 g of sugars per sachet, is free from soy and gluten, and uses monk fruit extract and sucralose for sweetness.
- Night Burn Saffron Elixir is free from gluten, dairy and nuts, has 0 g of sugar per sachet, and contains L-tryptophan.
- Grapefruit & Kombucha Slimming Blend is free from dairy and soy, and is halal-certified by JAKIM, the Department of Islamic Development Malaysia.[10] It is made on equipment that also processes gluten, fish, milk, soy, nuts, sesame seed and sulphur dioxide.
What do studies say about side effects?
The headline ingredient in each drink has been studied in people, and the safety results are reassuring.
- Moro blood orange extract (Morosil®), in Sicilian Orange Slimming Elixir and Sicilian Orange Slimming Elixir Zero. In a 6-month placebo-controlled trial in adults with overweight, all liver safety markers stayed within the normal range throughout the study. The researchers concluded that the extract may be a safe and effective option for weight management when used with diet and exercise.[2] For more on these trials, see does blood orange extract help with weight management?
- Sinetrol® Xpur citrus extract, in Grapefruit & Kombucha Slimming Blend. In a 12-week placebo-controlled trial of 95 adults with overweight, no adverse effects were observed, and kidney, liver and blood fat tests were unchanged.[3]
- Saffron extract, in Night Burn Saffron Elixir. A 2026 review of 102 clinical trials found saffron generally well tolerated. The effect people reported most often was a mild stomach upset, which in most cases settled on its own.[4] Read more in our look at saffron for sleep, mood and late-night cravings.
Every label also gives the same simple advice: stop taking the drink if you're unwell or have an allergic reaction.
Who should check with a doctor first?
Check with your doctor before you start any of our slimming drinks if you're pregnant, breastfeeding, on prescribed medication or have a medical condition, as each label advises. A few ingredients are worth knowing about:
- Pregnancy and breastfeeding. Our slimming drinks are formulated for adults.[10] Talk to your doctor first if you're pregnant or breastfeeding. Night Burn Saffron Elixir is not recommended during pregnancy or breastfeeding unless your doctor advises it.
- Statins and other prescription medicines. Grapefruit & Kombucha Slimming Blend contains grapefruit extracts, so its label asks anyone on a statin to check with a doctor first. Grapefruit can block an enzyme in the gut that breaks down some medicines, including some cholesterol-lowering statins, so more of the drug enters the blood.[5]
- Medicines that affect serotonin. Night Burn Saffron Elixir contains L-tryptophan, so speak to your doctor first if you take prescribed medication, especially medicines that affect serotonin.
- Caffeine. Grapefruit & Kombucha Slimming Blend has 22 mg of natural caffeine per scoop, less than the 37 mg in a typical 355 ml glass of green tea. The US Food and Drug Administration (FDA) cites 400 mg a day as an amount not generally linked with negative effects for most adults, and suggests talking to your doctor about caffeine if you're pregnant, trying to conceive or breastfeeding.[6] Night Burn Saffron Elixir is caffeine-free, and neither Sicilian Orange Slimming Elixir nor Sicilian Orange Slimming Elixir Zero has a caffeine-containing ingredient.
- Allergies. Read the full ingredient list and the free-from notes above, especially the shared-equipment note for Grapefruit & Kombucha Slimming Blend.
How can you tell if a slimming drink is safe?
Look for things you can check yourself: a full label, published lab tests, named certifications and a seller with a real presence in Singapore. In Singapore, health supplements don't need HSA approval or a licence to be sold. HSA bans medicinal ingredients in them and sets limits for toxic heavy metals, and the seller must make sure the product is not harmful.[7] Our guide on how to read a supplement label in Singapore explains why "HSA approved" on a supplement is a red flag.
| What to check | Look for | Be wary of |
|---|---|---|
| Ingredients | Every key ingredient named, with its amount per serving | A "proprietary blend" with no amounts |
| Hidden medicines | Published lab screens for weight-loss drugs and laxatives | "All-natural" or "herbal" labels with no test results |
| Manufacturing | Named certifications, such as HACCP or ISO 22000, from a brand you can contact | Quality logos with no details behind them |
| Claims | Studied ingredients at stated amounts, taken alongside healthy habits | Promises of quick, dramatic results, or "100% safe" |
| Seller | The brand's website and official stores, or retailers with an established presence in Singapore | Unknown sellers, or prices far below the usual |
Sources: HSA consumer advice on dubious weight loss products and on adulterated, counterfeit and substandard health products,[1] [8] and our guide to reading supplement labels.
HSA has seen adulterated slimming products carry fake quality logos, and it points out that no product is completely free of risk, so a "100% safe" claim is a warning sign rather than a reassurance.[1] [8] Reviews from verified buyers help too, as a check alongside these rather than instead of them.
What do our lab tests show?
Sicilian Orange Slimming Elixir and Grapefruit & Kombucha Slimming Blend have been screened for the kinds of hidden medicines HSA warns about, with none detected, and every drink in this guide has published heavy metal and microbe reports.[9]
- Sicilian Orange Slimming Elixir: SGS, an independent testing company, screened it for 10 weight-loss drugs and laxatives, and separately for 365 chemicals used in medicine. Nothing was detected in either test.
- Grapefruit & Kombucha Slimming Blend: an independent laboratory in Malaysia screened it for 10 weight-loss drugs and laxatives. All 10 were absent.
- Heavy metals and microbes: reports are published for Sicilian Orange Slimming Elixir, Sicilian Orange Slimming Elixir Zero, Night Burn Saffron Elixir and Grapefruit & Kombucha Slimming Blend. In the Night Burn Saffron Elixir report, none of the 5 heavy metals tested (arsenic, lead, mercury, cadmium and antimony) was detected, and no microbial growth was found.
Behind the reports, our drinks are made by production partners in Taiwan and Malaysia, in US FDA-registered facilities with HACCP and ISO 22000 certification, and we run extra testing in Taiwan and Singapore to screen for commonly found medicines.[10] You can open every report on our lab tests page.
How should you take them?
Take each drink at the time it's designed for, in the amount on the label. Our product guide has how to take and store every product.
- Sicilian Orange Slimming Elixir and Sicilian Orange Slimming Elixir Zero: 1 sachet a day, about 30 minutes before a meal, ideally your largest meal of the day. Shake, tear and sip, with no water needed.
- Night Burn Saffron Elixir: 1 sachet a day, 15 minutes before or after dinner. Shake well first.
- Grapefruit & Kombucha Slimming Blend: 1 scoop (12 g) a day, stirred into 300 to 350 ml of water, before breakfast or lunch.
Each one works best as daily support alongside balanced meals, regular movement and good sleep.
Sicilian Orange Slimming Elixir gives you 400 mg of Morosil® blood orange extract, 10 billion postbiotic cells and 500 mg of L-carnitine in every ready-to-drink sachet. It's halal-certified, free from dairy, gluten, soy and nuts, and its lab reports are published for you to check.
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Related reading: Are slimming teas a scam? What actually works for weight management · How to read a supplement label in Singapore · Does blood orange extract help with weight management?
Frequently asked questions
Does Sicilian Orange Slimming Elixir have side effects?
Sicilian Orange Slimming Elixir is built around 400 mg of Morosil® blood orange extract, and in a 6-month trial of Moro blood orange extract, liver safety markers stayed in the normal range. It is not a laxative, and SGS screening found no weight-loss drugs or laxatives in it. If you're pregnant, breastfeeding, on prescribed medication or have a medical condition, check with your doctor before you start.
Does Grapefruit & Kombucha Slimming Blend have side effects?
In a 12-week trial of its citrus extract, Sinetrol® Xpur, no adverse effects were observed, and kidney and liver tests were unchanged. Each scoop has 22 mg of natural caffeine. It also contains grapefruit extracts, so check with your doctor first if you take a statin or other prescription medicine. It is made on equipment that also handles common allergens, so read the label if you have allergies.
Does Night Burn Saffron Elixir contain caffeine?
No. Night Burn Saffron Elixir is caffeine-free and stimulant-free, which suits a drink taken around dinner. It contains L-tryptophan, so check with your doctor first if you take prescribed medication, especially medicines that affect serotonin.
Are The Purest Co slimming drinks halal?
Sicilian Orange Slimming Elixir is halal-certified by the Taiwan Halal Integrity Development Association, and Grapefruit & Kombucha Slimming Blend is halal-certified by JAKIM, the Department of Islamic Development Malaysia. Both are certified even if the current packaging doesn't show the halal logo yet.
Can I take Sicilian Orange Slimming Elixir and Night Burn Saffron Elixir together?
Yes. They are often paired as a day-and-night routine: Sicilian Orange Slimming Elixir about 30 minutes before a meal, and Night Burn Saffron Elixir 15 minutes before or after dinner. Our products can be taken together every day, as long as you follow each one's directions. If you take medication or have a health condition, ask your doctor first.
Are The Purest Co slimming drinks approved by HSA?
HSA does not approve or license health supplements before they are sold in Singapore, so no supplement can truly be called HSA approved. Sellers are responsible for safety, and HSA bans medicinal ingredients and limits heavy metals in supplements. Our drinks follow Singapore Food Agency regulations, and we publish their lab reports on each product page.
Key takeaways
- Our slimming drinks list their full ingredients with the amount of each key ingredient, and their lab reports are published.
- Sicilian Orange Slimming Elixir and Grapefruit & Kombucha Slimming Blend were screened for weight-loss drugs and laxatives, with none detected.
- In trials, liver markers stayed normal with Moro blood orange extract and Sinetrol® Xpur, and saffron was generally well tolerated.
- Check with your doctor first if you're pregnant, breastfeeding, on prescribed medication (especially a statin or a medicine that affects serotonin) or have a medical condition.
- Grapefruit & Kombucha Slimming Blend has 22 mg of natural caffeine per scoop; Night Burn Saffron Elixir is caffeine-free.
- Buy from the brand or established retailers, and be wary of "all-natural" products with no test results or promises of quick results.
About the author: Shereen is a Product Management Associate at The Purest Co. A Master's graduate in Pharmacy from Monash University, she brings four years of research experience to product development, with a focus on evidence-based, thoughtfully formulated supplements that support everyday wellbeing.
References
[1] Health Sciences Authority. Dubious weight loss products sold online can harm your health. 29 May 2026.
[2] Briskey D, Malfa GA, Rao A. Effectiveness of "Moro" blood orange Citrus sinensis Osbeck (Rutaceae) standardized extract on weight loss in overweight but otherwise healthy men and women: a randomized double-blind placebo-controlled study. Nutrients. 2022.
[3] Dallas C et al. Clinical study to assess the efficacy and safety of a citrus polyphenolic extract of red orange, grapefruit, and orange (Sinetrol-XPur) on weight management and metabolic parameters in healthy overweight individuals. Phytother Res. 2014.
[4] Hasheminasab FS et al. Adverse events of saffron (Crocus sativus L.): systematic review of current evidence. Health Sci Rep. 2026.
[5] US Food and Drug Administration. Grapefruit juice and some drugs don't mix. Content current as of 1 July 2021.
[6] US Food and Drug Administration. Spilling the beans: how much caffeine is too much? Content current as of 28 August 2024.
[7] Health Sciences Authority. Health supplements: overview. Last updated 30 October 2026.
[8] Health Sciences Authority. The dangers of adulterated, counterfeit and substandard health products. 9 April 2026.
[9] The Purest Co. Lab tests: published test reports for each product, including SGS weight-loss drug screens for Sicilian Orange Slimming Elixir.
[10] The Purest Co. Help Center: certified manufacturing, halal-certified products and products formulated for adults.
These statements have not been evaluated by any regulatory authority. This product is not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary. Consult a healthcare provider before use if you are pregnant, breastfeeding, or on prescribed medication.