NuviaLab Sugar Control Review 2026Is It Worth the Money?

What is in it, per 2 capsules: bitter melon extract 500 mg, gymnema (GS4 Plus) 200 mg, Ceylon cinnamon extract 100 mg, white mulberry leaf extract 100 mg, green tea extract 100 mg (40 mg EGCG), alpha-lipoic acid 30 mg, vitamin B6 14 mg, zinc 15 mg and chromium 200 µg.

What the evidence says:

• A Cochrane review of bitter melon found no significant difference in glycaemic control; newer meta-analyses found small HbA1c drops in low-quality trials.
• The sales page's "study" box matches a 1990 study in 27 people with insulin-dependent diabetes that used gymnema at 400 mg a day; the capsule has 200 mg.
• Alpha-lipoic acid is 30 mg, 5% of the 600 mg dose a neuropathy trial found best.
• Vitamin B6 at 14 mg is above the NHS advice of 10 mg a day in supplements.

There is no money-back guarantee; the terms allow 10 days from purchase. It is not a substitute for diabetes treatment.

Our Dose Check compares each label amount with the best human study we could read.

• Gymnema (GS4 Plus): 200 mg vs 400 mg a day in a 1990 study of 27 people on insulin. 50%.
• Cinnamon: 100 mg of extract vs 120 mg to 6 g a day in the 10-trial meta-analysis. 83% of the lowest dose, before allowing for extract strength.
• Alpha-lipoic acid: 30 mg vs 600 mg a day, the dose a 2006 diabetic-neuropathy trial found gave the best balance of benefit and risk. 5%.
• Green tea: 100 mg of extract, 40 mg of EGCG. The EFSA links 800 mg EGCG a day and above to raised liver enzymes; the label is 5% of that.
• Chromium: 200 µg vs 200 to 1,000 µg a day in the Cochrane weight trials. The lowest trial dose, and 500% of the reference value on the label.
• Bitter melon (500 mg) and white mulberry (100 mg): no dose in the abstracts, so no comparison.
• Vitamin B6: 14 mg vs the NHS advice of no more than 10 mg a day in supplements. 140%.
• Zinc: 15 mg, within the NHS 25 mg limit.

The directions say 2 capsules a day with about 300 ml of water. A 60-capsule bottle lasts a month.

Our Transparency Score checks five things a buyer can verify. NuviaLab Sugar Control scores 2 out of 5.

• Label with doses: yes. All nine actives have an amount in the text panel.
• Identifiable company: no. The Swiss and German terms name "Key Player Limited" at Dubai Airport Freezone and apply UAE law; the English terms name "NuviaLabSugarControl.com" in Hong Kong. Both exclude EU law. No manufacturer or registration number is given.
• Refund terms in writing: yes. 10 calendar days from purchase, unused goods only.
• Independent testing shown: no. The page shows a "Laborgetestet" (laboratory tested) badge but no report.
• Study on the finished product: no. The "study" box on the sales page is a gymnema extract study with 27 treated people, not a trial of this capsule.

NuviaLab, the co-seller, has 1.9 out of 5 from 148 reviews on Trustpilot; complaints concern refunds and returns.

Correction. An earlier version of this review said the product was built around berberine (it has none), said it "does not publish per-serving amounts" (it does), showed a four-row dose table, scored it 4.5 out of 5 in the box and 10 out of 10 for dosage and transparency, listed "no side effects" as a pro, showed a 90-day guarantee and free shipping, and said the price was not published. The real US prices are $49.99, $99.98 and $149.97, and there is no guarantee. We have corrected it.

Prices when we checked in September 2026:

• Swiss site (where our link leads, in German): CHF 41.99 for 1 bottle, CHF 83.98 for 2+1 (CHF 27.99 each), CHF 125.97 for 3+3 (CHF 20.99 each).
• US site: $49.99, $99.98 ($33.33 each) and $149.97 ($25.00 each). NuviaLab's own store lists the same US prices.

That is about $1.67 a day for one bottle and $0.83 a day for the six-bottle pack (our calculation). We could not verify shipping costs.

Refunds. The pages offer no money-back guarantee. The English terms say the customer may withdraw only "within 10 calendar days from the date of purchase of goods", that returns "must be preceded by a written statement" and that goods "can not bear traces of use". They add: "The application of EU law is not possible." NuviaLab's own store allows 14 days from receipt and excludes "any opened and used cosmetics, tablets or supplements".

• Vitamin B6: 14 mg is above the NHS advice of 10 mg a day in supplements. The NHS says 200 mg or more a day can cause nerve damage, and that the effect of 10 to 200 mg "is unclear".
• Blood sugar medicines: bitter melon, gymnema, cinnamon, green tea and chromium lowered glucose in trials. The label says to consult a doctor if you use insulin or oral diabetes drugs.
• Chromium: the NCCIH notes stomach pain and bloating, and rare kidney, liver and muscle problems after large doses. 200 µg is far below the 10 mg a day the NHS says is unlikely to cause harm.
• Green tea extract: the label gives 40 mg of EGCG, well below the 800 mg the EFSA links to raised liver enzymes.
• Zinc: 15 mg is within the NHS 25 mg limit.

The sales page says the product "does not cause any side effects" and is "completely safe and effective". The label's own caution tells people on insulin or diabetes drugs to see a doctor. There is no clinical study of NuviaLab Sugar Control itself.