A probiotic kids actually ask for

Duolac 얌얌 플러스 (Yam Yam Plus) is a yogurt-flavored chewable probiotic for growing kids, with vitamin D and zinc added. Little bear-shaped tablets, from Korea's World-Class Product probiotic brand.

World-Class Product brand, Korea's Ministry of Trade, Industry and Energy (2024).

Over 37 million tablets sold

Yam Yam is one of Duolac's best-loved kids' lines in Korea: 37,780,600 tablets sold and counting.

Cumulative sales as of April 2025.

Parents keep coming back

Here's what parents on Duolac's Korean store say:

• “My kid loves it, so I'm buying it again.”
• “My child prefers it to the powder type and eats it well.”
• “I have two kids taking it, and the younger one asks for it even more.”
• “We've tried the whole Yam Yam range, and this is the one they eat best.”

Reviews from Duolac's Korean store, translated by Gochujar. Individual results may vary.

Why parents choose Yam Yam Plus

A probiotic only works if your child will take it every day. Yam Yam Plus makes that the easy part: a tasty chewable, just two tablets a day.

• Yogurt flavor kids enjoy
• Probiotics plus vitamin D and zinc in one
• 6 probiotic strains, 100% Korean in origin
• No fridge needed

Cute little bears, yogurt flavor

Each tablet is shaped like a small bear and chewed like a treat, so there's no powder to mix and no capsule to swallow.

Two chewable tablets. Once a day.

A daily probiotic designed around growing kids.

• 6 probiotic strains, 100% Korean in origin
• 4 billion CFU guaranteed per daily serving
• Vitamin D (10 µg) and zinc (8.5 mg), 100% of the Korean daily reference value
• Made only with strains on the US FDA GRAS register*
• Patented dual coating helps cultures reach the gut alive
• Keeps at room temperature

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

Made for your family if…

• Your child won't take powders or capsules
• You want probiotics, vitamin D and zinc in one simple step
• Your child is a picky eater
• You want something easy to keep on hand at home or on trips
• Your child's molars have come in and they can chew tablets

Specialists, not generalists

Before you choose a probiotic for your child, check who designed it. Duolac has spent 30 years researching one thing: probiotic strains of Korean origin.

Six strains, all from Korea

Chosen with Korean guts in mind: a blend of lactobacillus and bifidobacterium, five of them patented strains.

• Streptococcus thermophilus CBT-ST3
• Bifidobacterium longum CBT-BG7 (patented)
• Bifidobacterium lactis CBT-BL3 (patented)
• Lactobacillus acidophilus CBT-LA1 (patented)
• Lactiplantibacillus plantarum CBT-LP3 (patented)
• Lacticaseibacillus rhamnosus CBT-LR5 (patented)

47 scientists behind every tablet

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, especially for kids. 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)

Quality certifications: GMP, CODEX HACCP, ISO 9001. Certifications apply to the manufacturer and specific ingredients or strains.

More than probiotics

Alongside 4 billion guaranteed CFU, every daily serving adds two nutrients growing kids need.

• Probiotics: support gut health
• Zinc: needed for normal immune function and cell division
• Vitamin D: needed for calcium absorption and bone formation

Functions as recognized by Korea's MFDS for health functional food ingredients.

Why the blend matters

Each strain has its own home in the gut and its own growth pace, and gut flora changes as kids grow. Yam Yam Plus pairs lactobacillus and bifidobacterium in a 67:33 ratio, designed by Duolac's Microbiome Institute for children.

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. It's patented in the EU, US, 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, so they're happy at room temperature: in the kitchen cupboard, a school bag or a travel case.

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

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 얌얌 플러스 (Yam Yam Plus) chewable probiotics for kids

Contents

80 chewable tablets × 750 mg (40-day supply)

Probiotics

4 billion CFU guaranteed per daily serving

Strains

S. thermophilus CBT-ST3, B. longum CBT-BG7, B. lactis CBT-BL3, L. acidophilus CBT-LA1, L. plantarum CBT-LP3, L. rhamnosus CBT-LR5

Added nutrients

Vitamin D 10 µg and zinc 8.5 mg per daily serving (100% of the Korean daily reference value)

Other ingredients

Xylitol, isomalt, D-sorbitol, fructooligosaccharides, yogurt and milk flavors, seaweed calcium, and more

Flavor

Yogurt; bear-shaped tablets

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.

How to take

2 tablets (1.5 g) once a day, chewed. Suitable once your child's molars have come in.

Storage

Room temperature, away from humidity and direct sunlight

Shelf life

2 years from the date of manufacture

Manufacturer

Cell Biotech Co., Ltd., Gimpo, Republic of Korea

Country of origin

South Korea

Q&A

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