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[Duolac] Gold Premium Probiotics Capsules (One-A-Day)
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Korea's 30-Year Best-Seller, in a Capsule
[Duolac] Gold Premium Probiotics Capsules (One-A-Day)
- 10 billion CFU per day
- 6 Korean strains
- No fridge needed
- 30-day supply
The best probiotic is the one you'll actually take every day. Duolac Gold Capsules (듀오락 골드 캡슐) make that easy: one capsule, a glass of water, done.
Duolac Gold has been Duolac's premium best-seller for 30 years, and in Korea the capsules are rated 4.9 out of 5 from over 12,000 reviews. Prefer powder? Try Duolac Gold One-A-Day Packets, with added vitamins.
Here's the catch with most probiotics: stomach acid and bile can wipe out the cultures before they ever reach your gut.
Duolac takes a different approach. Its patented dual coating wraps each culture to help it reach the gut alive, and its six Korean-origin strains are all tested in human trials with Korean adults.
And because the strains are stable at room temperature, there's no fridge needed, at home or on the road.
So what's inside?
Full Ingredients List Probiotics: Streptococcus thermophilus CBT-ST3, Lactobacillus acidophilus CBT-LA1, Bifidobacterium lactis CBT-BL3, Lacticaseibacillus rhamnosus CBT-LR5, Bifidobacterium longum CBT-BG7 and Bifidobacterium bifidum CBT-BF3, all on the US FDA GRAS register, with 10 billion CFU guaranteed per daily serving. Plus fructooligosaccharides, corn starch, galactooligosaccharides and stearic acid. Capsule: HPMC (plant-based), titanium dioxide (color).
To take 1 capsule once a day, with water. Best about 30 minutes after a meal.
In the box 30 capsules × 500 mg, a full 30-day supply. Made in South Korea by Cell Biotech Co., Ltd. (Gimpo).
To keep At room temperature, away from humidity and direct sunlight. Good for 2 years from the date of manufacture. Don't eat the desiccant packet.
Good to know Contains milk and soy. If you're pregnant, breastfeeding, taking medication or under medical care, check with your doctor first. This is a dietary supplement. It is not intended to diagnose, treat, cure or prevent any disease.
[Duolac] Gold Premium Probiotics Capsules (One-A-Day)
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.
From 2008 to 2023, Duolac sold 1,712,247 boxes of Duolac Gold, over 100 million sticks and capsules, and collected 31,773 customer reviews along the way (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 mom 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.
Looking for a premium, high-count probiotic? Strains that are 100% Korean in origin? Probiotics recognized around the world? And done switching, with one you can finally stick with? It's all here, in one capsule a day.
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.
Every capsule guarantees 10 billion CFU from six probiotic strains, 100% Korean in origin. One box of 30 capsules is a full 30-day supply.
Six reasons it stands apart
Six probiotic strains, 100% Korean in origin and chosen with Korean guts in mind, formulated only with strains on the US FDA GRAS register*.
The strains are tested in human trials with Korean adults, in a science-backed formula built for adult gut health.
Duolac's patented dual coating (Korea, US, EU, Japan, China) helps the cultures reach your gut alive. And it's been 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, check who made it. Duolac has spent 30 years researching one thing: probiotic strains of Korean origin. All six strains in Duolac Gold are isolated from Koreans and put through human trials with Korean adults.
They are Bifidobacterium longum CBT-BG7, Bifidobacterium bifidum CBT-BF3, Bifidobacterium lactis CBT-BL3, Lacticaseibacillus rhamnosus CBT-LR5, Lactobacillus acidophilus CBT-LA1 and 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.
That work adds up to 107 patents, 35 human trials, 124 published papers and 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.
Its strains' functionality is recognized under Korea's MFDS health functional food standards. The strains are deposited with Germany's DSMZ and the Korean Collection for Type Cultures (KCTC), and the DNA sequence of each one is registered with the US NCBI.
Duolac exports to 55 countries and was Korea's No.1 probiotic exporter 11 years running (2013–2023). It's also a World-Class Product brand, named by 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.
Trusted far beyond Korea
Duolac isn't just Korea's favorite. It's a probiotic the world has noticed.
It's No.2 in pharmacy health-supplement sales in Denmark, the home of probiotics (DLI data, Dec 2023), and holds more strains on the US FDA GRAS register than any other company.
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, and delivery and customer service.
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.
The bifidobacteria are B. longum CBT-BG7, B. bifidum CBT-BF3 and B. lactis CBT-BL3, all patented strains. The lactic acid bacteria are L. rhamnosus CBT-LR5 and L. acidophilus CBT-LA1 (both patented) and 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).
Full Ingredients List
Duolac Gold Premium Probiotics Capsules
Probiotics: Streptococcus thermophilus CBT-ST3, Lactobacillus acidophilus CBT-LA1, Bifidobacterium lactis CBT-BL3, Lacticaseibacillus rhamnosus CBT-LR5, Bifidobacterium longum CBT-BG7 and Bifidobacterium bifidum CBT-BF3 (10 billion CFU guaranteed per daily serving), fructooligosaccharides, corn starch, galactooligosaccharides, stearic acid. Capsule: hydroxypropyl methylcellulose (HPMC), titanium dioxide (color).
Allergy: contains milk and soy
Original label (Korean)
Real Product Photos
Straight from Korea
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