Article
Does Kuro Oiru have side effects? Safety tests, who can't take it, who should ask a doctor (2026)
Reviewed by Health Advisor Team
Short answer: ZENSO Kuro Oiru is a chewable tablet that Singapore's NPRA classifies as a food. SGS tested it against 365 drugs and for heavy metals, and found none. The most important point: it contains chitosan from crustacean shells, so anyone allergic to shellfish or crustaceans must not take it. If you are pregnant or breastfeeding, on medication or managing a long-term condition, ask your doctor first. It is not suitable for under-18s.
Safety tests
| Item | Result |
|---|---|
| SGS drug screening | 365 drugs screened, none found |
| SGS heavy metals | Not detected |
| Bio Synergy | No harmful microbes detected |
| Halvec | No porcine DNA detected |
| Certification | JAKIM Halal certified |
| Classification (Malaysia, where it is made) | Classified as a food by NPRA |
| Per tablet (1 g) | 4 kcal, 0 g sugars, 0 g fat; sweetened with isomalt and sucralose |
Who can't take it?
- Allergic to shellfish or crustaceans: don't take it. The chitosan comes from crustacean shells.
- Allergic to any ingredient in the formula: don't take it. Read the ingredient list once before you start.
- Under 18: not suitable.
Who should ask a doctor first?
- Pregnant or breastfeeding: ask your doctor first.
- On medication: ask your doctor or pharmacist first.
- Managing a long-term condition: ask your doctor or pharmacist first.
If you notice ongoing discomfort, a rash or anything that worries you after taking it, stop and ask your doctor.
How much to take
Follow the label: chew one tablet 30 minutes before lunch and one 30 minutes before dinner, two a day. If you miss one, chew one before your next meal as usual. Don't take two at once to catch up.
Frequently asked questions
I'm allergic to seafood. Can I take it?
No. Kuro Oiru contains chitosan from crustacean shells. If you're allergic to shellfish or crustaceans, don't take it.
Does Kuro Oiru have sugar?
The label lists 0 g sugars, 0 g fat and 4 kcal per tablet. The sweetness comes from isomalt and sucralose.
Can Muslims take it?
Yes. It is JAKIM Halal certified, and Halvec Laboratories, a JAKIM panel laboratory, found no porcine DNA.
Why is there no KKM MAL number?
Because it is a food (a chewable tablet), not a medicine. MAL numbers are given to medicines and certain supplements, and Singapore's NPRA classifies Kuro Oiru as food. SGS tested it against 365 drugs and found none.
Can pregnant women or teenagers take it?
If you are pregnant or breastfeeding, ask your doctor first. It is not suitable for under-18s.
Buy or learn more
For the full formula and test details, go to the Kuro Oiru product page. For how to take it, read how to take Kuro Oiru.
ZENSO Kuro Oiru Fat Blocker
S$130
From S$130 / bottle
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