Korea's premium probiotic, now in one capsule

Duolac Gold is the formula Duolac is proudest of: a premium probiotic for adults who want to look after their gut for the long run. This is the capsule version, one easy capsule a day, from Korea's World-Class Product probiotic brand.

• 1,712,247 boxes sold (2008–2023)
• 100,551,621 sticks and capsules sold (2008–2023)
• 31,773 customer reviews (2016–2024)

Figures from Duolac, covering Duolac Gold products and reviews on Duolac's own Korean stores.

“I've taken it for over 10 years.”

You don't stay with a supplement for a decade unless it earns its place. Duolac Gold capsules are rated 4.9 out of 5 from over 12,000 reviews in Korea. Here's what customers say:

• “I've been taking it for more than 20 years. It's the king of my supplements.”
• “I take it consistently, and I can really tell the difference when I skip it.”
• “It worked so well for me that I bought some for my parents. My mum asks for it again.”

Rating and reviews from Duolac's Korean online store (as of September 2026), translated by Gochujar. Individual results may vary.

Look after your gut for life

Your gut works hard every day. Duolac Gold capsules make looking after it the simplest part of your routine.

Tried them all? This is where people land.

• You want a premium, high-count probiotic
• You want strains that are 100% Korean in origin
• You want probiotics recognized around the world
• You're done switching and want one you can stick with

In the end, it's Duolac

People try other probiotics and come back. A premium formula you can take for the long run.

One capsule, once a day

No powder, no measuring. Just one capsule with a glass of water, and your daily probiotic is done.

• 10 billion CFU guaranteed in every capsule
• 6 probiotic strains, 100% Korean in origin
• 30 capsules, a full 30-day supply

Six reasons it stands apart

• 6 probiotic strains, 100% Korean in origin, chosen with Korean guts in mind
• Formulated only with strains on the US FDA GRAS register*
• Strains tested in human trials with Korean adults
• A science-backed strain formula built for adult gut health
• Patented dual coating (Korea, US, EU, Japan, China) that helps cultures reach the gut alive
• A premium best-seller for 30 years

*GRAS relates to ingredient safety, not to health benefits.

The Gold formula, in a single capsule

Everything that has made Duolac Gold Duolac's flagship for 30 years, now in one easy capsule a day. It's the same six-strain premium formula, without the added vitamins of the powder sticks.

Prefer powder? See our Duolac Gold One-A-Day Packets.

Specialists, not generalists

Before you choose a probiotic, ask who made it. Duolac has spent 30 years researching one thing: Korean-origin probiotic strains. All six strains in Duolac Gold are isolated from Koreans and put through human trials with Korean adults.

• Bifidobacterium longum CBT-BG7
• Bifidobacterium bifidum CBT-BF3
• Bifidobacterium lactis CBT-BL3
• Lacticaseibacillus rhamnosus CBT-LR5
• Lactobacillus acidophilus CBT-LA1
• Streptococcus thermophilus CBT-ST3

47 scientists behind every capsule

Duolac doesn't buy in its strains. It develops them itself: sourced from healthy Koreans and traditional Korean fermented foods, safety-verified in human trials, and researched strain by strain with next-generation genome sequencing.

• 107 patents
• 35 human trials
• 124 published papers
• 231 research achievements in total

Cell Biotech figures, as of 2025.

What does “CBT” mean?

Every probiotic strain has a name, just like people do. CBT stands for Cell Biotech, the company behind Duolac, and marks strains Duolac developed itself. When you see CBT, you know where it came from.

Safety you can check for yourself

Probiotics are live cultures, so safety comes first. Duolac uses only strains on the US FDA GRAS (Generally Recognized As Safe) register, and holds more GRAS-listed strains than any other company in the world (as of February 2024).

GRAS is the FDA's safety recognition for food ingredients. It relates to safety, not to health benefits.

Verified at every level

Duolac doesn't just say its probiotics are safe. It shows you the paperwork.

• Strain functionality recognized under Korea's MFDS health functional food standards
• Strains deposited with Germany's DSMZ and the Korean Collection for Type Cultures (KCTC)
• DNA sequence of each strain registered with the US NCBI
• Exported to 55 countries; No.1 Korean probiotic exporter 11 years running (2013–2023)
• World-Class Product brand, Korea's Ministry of Trade, Industry and Energy (2024)

Quality certifications: GMP, CODEX HACCP, ISO 9001, MUI Halal, OK Kosher, BPOM. Some apply to specific products or strains.

A formula built for grown-up guts

Not a random mix. Using years of strain-analysis data, Cell Biotech's Microbiome Institute balanced the blend at 47% Bifidobacterium and 53% Lactobacillus for adult gut health.

• Bifidobacteria: B. longum CBT-BG7, B. bifidum CBT-BF3, B. lactis CBT-BL3 (all patented strains)
• Lactic acid bacteria: L. rhamnosus CBT-LR5, L. acidophilus CBT-LA1 (patented strains), S. thermophilus CBT-ST3

Why the ratio makes the difference

More strains isn't automatically better. Each one lives in a different part of the gut, grows at its own pace, and our gut flora shifts as we age. Duolac tunes each blend to match.

Proven in a human trial

In a clinical study of Duolac Gold's six strains in Korean adults with sensitive guts, 68% of those taking the probiotics reported overall relief of gut discomfort, compared with 37.5% in the placebo group.

Yoon JS et al., “Effect of multispecies probiotics on irritable bowel syndrome: a randomized, double-blind, placebo-controlled trial,” Journal of Gastroenterology and Hepatology (2014). Individual results may vary.

Built for kimchi, garlic and chili

Love bold Korean food? So do these strains. In a lab (cell) study, all six Duolac Gold strains kept growing alongside garlic, onion, ginger and red chili.

Kim et al., Korean Journal of Food and Nutrition 50(1) (2021): 16–28.

Protected all the way down

A probiotic only helps if it survives the trip. Duolac's patented dual coating wraps each culture in a tough matrix of protein and polysaccharide, shielding it from stomach acid and bile so it reaches the gut alive.

Patented in 5 major markets

This technology is protected by patents in the European Union, United States, South Korea, China and Japan.

Up to 221× more reach the gut

The coating makes a real difference. In a human study, people taking dual-coated probiotics had up to 221 times more of the strain in their gut (L. rhamnosus CBT-LR5) than those taking uncoated probiotics.

Randomized, double-blind, controlled study of 40 adults over 2 weeks. Individual results may vary.

No fridge? No problem.

Duolac's CBT strains were confirmed to survive from −70°C all the way up to 40°C. Keep it in your bag, at your desk or in your suitcase.

Tested by the Korea Functional Food Research Institute (samples provided by Cell Biotech).

Alive, and it shows

Under the microscope, Duolac's CBT probiotics kept multiplying over time in strain-by-strain lab tests. Live cultures, confirmed.

Tested by the Korea Food Research Institute (samples provided by Cell Biotech).

Trusted far beyond Korea

Duolac isn't just Korea's favourite. It's a probiotic the world has noticed.

• Exported to 55 countries; No.1 Korean probiotic exporter 11 years running (2013–2023)
• No.2 in pharmacy health-supplement sales in Denmark, the home of probiotics (DLI data, Dec 2023)
• More strains on the US FDA GRAS register than any other company
• World-Class Product, Korea's Ministry of Trade, Industry and Energy (2024)

Figures relate to the Duolac brand.

From strain to your door, all Duolac

No outsourcing, no shortcuts. Duolac runs every step itself, to global standards.

• Strain development and research
• Culturing and isolation
• Patented coating and freeze-drying
• Strain blending
• Finished product manufacturing
• Quality testing
• Delivery and customer service

Product

Duolac Gold capsules (듀오락 골드 캡슐), premium probiotics

Contents

30 capsules × 500 mg (15 g), a 30-day supply

How to take

1 capsule once a day, with water

Per serving (1 capsule)

0 kcal · probiotics 10 billion CFU guaranteed

Probiotic strains

S. thermophilus CBT-ST3, L. acidophilus CBT-LA1, B. lactis CBT-BL3, L. rhamnosus CBT-LR5, B. longum CBT-BG7, B. bifidum CBT-BF3

Other ingredients

Fructooligosaccharides, corn starch, galactooligosaccharides, stearic acid. Capsule: hydroxypropyl methylcellulose (HPMC), titanium dioxide (colour).

Allergens

Contains milk and soy. Made in a facility that also handles eggs, buckwheat, peanuts, wheat, mackerel, crab, shrimp, peach, tomato, sulfites, walnuts, chicken, squid, shellfish and pine nuts.

Storage

Room temperature, away from humidity and direct sunlight

Shelf life

2 years from the date of manufacture

Cautions

Consult a professional if you have a medical condition or take medication. People with allergies may react. Keep out of children's reach. Do not eat the desiccant.

Manufacturer

Cell Biotech Co., Ltd., Gimpo, South Korea

Country of origin

South Korea

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