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[Duolac] Gold Premium Probiotics (One-A-Day Packets)
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Korea's 30-Year Best-Seller
[Duolac] Gold Premium Probiotics (One-A-Day Packets)
- 10 billion CFU per day
- 6 Korean strains
- No fridge needed
- 30-day supply
If you've been looking for a daily probiotic you can actually stick with, Duolac Gold (듀오락 골드) is where much of Korea has landed, and stayed, for 30 years.
It's the flagship of Duolac, Korea's No.1 probiotic exporter. Every daily stick guarantees 10 billion live cultures from 6 Korean-origin strains, all tested in human trials with Korean adults, plus prebiotics and vitamins A, B1, B2, B6, C and E. Prefer it without the vitamins? Try Duolac Gold Capsules.
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 in a protective layer of protein and polysaccharide, helping it survive the journey and arrive alive.
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, Lactobacillus acidophilus, Bifidobacterium lactis, Lacticaseibacillus rhamnosus, Bifidobacterium longum and Bifidobacterium bifidum, all on the US FDA GRAS register, with 10 billion CFU guaranteed per daily serving. Plus fructooligosaccharides, isomerized lactose blend (lactulose, maltodextrin), galactooligosaccharides, lactose, orange flavor powder {orange powder, sugar, dextrin, orange flavor blend (dextrin, orange juice concentrate, lactose, natural flavor, ethanol, gum arabic, polysorbate 80, artificial flavor, tocopherol), citric acid, tricalcium phosphate, gardenia yellow (color), enzymatically modified stevia (sweetener), sodium carboxymethylcellulose, refined salt}, milk flavor blend (dextrin, flavor, propylene glycol, gum arabic), corn starch, orange flavor blend (dextrin, orange juice concentrate, lactose, natural flavor, ethanol, gum arabic, polysorbate 80, artificial flavor, d-tocopherol), fermented rice powder, vitamin C, vitamin E blend (dl-α-tocopheryl acetate, modified starch, glucose syrup powder, silicon dioxide), vitamin A blend (glucose syrup powder, gum arabic, corn starch, vitamin A acetate, dl-α-tocopherol), vitamin B6 (pyridoxine hydrochloride), vitamin B1 (thiamine hydrochloride) and vitamin B2 (riboflavin).
To take 1 stick (3 g) once a day, straight onto your tongue or stirred into water below 40°C / 104°F. Best about 30 minutes after a meal.
In the box 30 sticks × 3 g, 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.
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 (One-A-Day Packets)
The probiotic Korea has trusted for 30 years
Duolac Gold is the one Duolac is proudest of: a premium formula made for adults and older adults who want to look after their gut for the long run.
World-Class Product brand, Korea's Ministry of Trade, Industry and Energy (2024).
Duolac Gold, in two styles
Duolac Gold One-A-Day Packets: an easy once-daily stick with added vitamins A, B1, B2, B6, C and E. That's this one.
Duolac Gold Capsules: an easy once-daily capsule, for those who prefer their probiotic without the added vitamins.
Both have six Korean-origin probiotic strains, 66 billion CFU added and 10 billion CFU guaranteed, plus prebiotics. The strains have been through a human study with Korean participants.
Three decades at the top
Trends come and go. Duolac Gold has stayed Duolac's premium best-seller for 30 years, because once people find a probiotic that works for them, they stick with it.
Nearly 100 million sold, and counting
The numbers speak for themselves: 1,712,247 boxes and 100,551,621 sticks and capsules sold from 2008 to 2023, and 31,773 customer reviews from 2016 to 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. Here's what long-time customers in Korea say:
“Duolac Gold has been my friend for 20 years.”
“I've taken it every day for 10+ years. A product I trust.”
“I've bought it for my mother for over 10 years. There's no probiotic like it.”
“Almost 10 years now. I'll probably take it for life.”
“We've taken it since 2015. Duolac looks after our family's gut health.”
Reviews from Duolac's Korean online store, translated by Gochujar. Individual results may vary.
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? You've found your probiotic.
Simple to take, every day
One stick a day is all it takes. Tear, pour, done.
Made for adults and older adults: 30 sticks of 3 g, a full 30-day supply, with 10 billion CFU guaranteed in every serving.
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.
What's inside every stick
66 billion CFU go into every serving, so a full 10 billion CFU is guaranteed by the time it reaches you. Probiotics may help good bacteria thrive, keep harmful bacteria in check, and support regular, comfortable digestion.
Plus prebiotics (fructooligosaccharides and galactooligosaccharides) to feed the good bacteria, and vitamins A, B1, B2, B6, C and E.
How to take: one stick a day, straight onto your tongue or stirred into lukewarm water (below 40°C / 104°F).
Made for you if…
You want probiotic strains that are 100% Korean in origin, backed by human trials with Korean adults.
You need a high-count probiotic you can rely on.
Your parents' digestion isn't as regular as it used to be.
You're busy, eat on the go, and your gut feels it.
You have a sensitive stomach.
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.
6 CBT strains, 100% from Korea
Isolated from Koreans and put through human trials with Korean adults, so you know exactly what you're taking.
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.
Developed in-house, over 30 years
Duolac doesn't buy in its strains. It develops them itself: 100% Korean strains sourced from healthy Koreans and traditional Korean fermented foods, safety-verified in human trials with Korean adults, and researched strain by strain with next-generation (NGS) genome sequencing.
47 scientists behind every stick
Cell Biotech's Microbiome Institute, the team behind Duolac, brings together 47 researchers with master's and doctoral degrees.
Their track record: 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 it marks strains Duolac developed itself. When you see CBT, you know where it came from.
Example: genus Lactobacillus, species acidophilus, strain CBT-LA1.
Safety you can check for yourself
Probiotics are live bacteria, so safety matters more than anything. As of February 2024, Duolac has more probiotic strains on the US FDA GRAS (Generally Recognized As Safe) register than any other company in the world, and Duolac Gold uses only GRAS-listed strains.
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 handles every step in-house 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. The quality you get is the quality they intended.
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 and other lactic acid bacteria.
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 the ratio for every product so each strain can reach where it's needed and do its job.
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, nearly double the 37.5% in the group that didn't (p<0.05).
Yoon JS et al., “Effect of multispecies probiotics on irritable bowel syndrome: a randomized, double-blind, placebo-controlled trial,” Journal of Gastroenterology and Hepatology 29 (2014): 52–59. 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, red chili and Cheongyang chili. Results in the body may differ.
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 your 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 (20 uncoated, 20 dual-coated; 5 × 10⁹ viable cells a day). Source: “Effect of double-coated probiotic formulation on functional constipation in the elderly.” Individual results may vary.
No fridge? No problem.
Duolac's CBT strains were confirmed to survive from −70°C all the way to 40°C. Keep it in your bag, at your desk or in your suitcase. Perfect for shipping overseas, too.
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 (One-A-Day Packets)
Probiotics: Streptococcus thermophilus, Lactobacillus acidophilus, Bifidobacterium lactis, Lacticaseibacillus rhamnosus, Bifidobacterium longum and Bifidobacterium bifidum (10 billion CFU guaranteed per daily serving), fructooligosaccharides, lactulose blend powder (lactulose, maltodextrin), galactooligosaccharides, lactose, orange powder (orange powder, refined sugar, dextrin, orange flavor blend [dextrin, orange concentrate, lactose, natural flavor, ethanol, gum arabic, polysorbate 80, synthetic flavor, tocopherol], anhydrous citric acid, tricalcium phosphate, gardenia yellow, enzymatically modified stevia (sweetener), sodium carboxymethylcellulose, refined salt), milk flavor blend (dextrin, flavoring, propylene glycol, gum arabic), processed starch (corn starch), orange flavor blend (dextrin, orange concentrate, lactose, natural flavor, ethanol, gum arabic, polysorbate 80, synthetic flavor, d-tocopherol), other processed product (fermented rice powder), vitamin C, vitamin E blend (dl-α-tocopheryl acetate, modified starch, glucose syrup powder, silicon dioxide), vitamin A powder blend (glucose syrup powder, gum arabic, corn starch, vitamin A acetate, dl-α-tocopherol), vitamin B6 hydrochloride, vitamin B1 hydrochloride, vitamin B2.
Allergy: contains milk and soy
Original label (Korean)
Real Product Photos
Straight from Korea
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