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First Day - Teens' 3-in-1 Pre+ Post+ Probiotic
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ToddlersAges 2 – 3
\ \ Toddlers' Multivitamin\ \ Support for development when it matters most.](https://firstday.com/products/the-no-junk-toddlers-multivitamin) \ \ Toddlers' Probiotic+\ \ For softer, easier to pass stools.](https://firstday.com/products/toddlers-3-in-1-probiotic)
KidsAges 4 – 12
\ \ Kids' Multivitamin\ \ Daily nutrition to support mood & behavior.](https://firstday.com/products/kids-enrichment-vitamin) \ \ Kids' Probiotic+\ \ To help improve immunity, digestion & oral health.](https://firstday.com/products/kids-3-in-1-pre-post-probiotic-swap) \ \ Kids' Magnesium\ \ Helps kids fall asleep, and stay asleep during the night.](https://firstday.com/products/kids-calming-magnesium) \ \ Kids' Brain Support\ \ Support for learning, attention & focus.](https://firstday.com/products/kids-daily-focus)
TeensAges 13 - 17
\ \ Teens' Multivitamin\ \ Daily support for motivation & mood.](https://firstday.com/products/teens-kickstart-vitamin) \ \ Teens' Probiotic+\ \ Gut health support for immunity & skin health.](https://firstday.com/products/first-day-teens-3-in-1-pre-post-probiotic) \ \ Teens' Magnesium\ \ Helps teens wind down & sleep through the night.](https://firstday.com/products/teens-calming-magnesium) \ \ Teens' Brain Support\ \ Support for memory, focus & learning.](https://firstday.com/products/teens-daily-focus)
WomenAges 18+
\ \ Women's Multivitamin\ \ All-day support for women.](https://firstday.com/products/womens-supercharge-vitamin) \ \ Women's Probiotic+\ \ For digestion, bloating & feminine health.](https://firstday.com/products/first-day-womens-3-in-1-pre-post-probiotic) \ \ Women's Magnesium\ \ Helps calm the body after a busy day.](https://firstday.com/products/womens-calming-magnesium) \ \ Women's Brain Support\ \ Support for memory & brain fog.](https://firstday.com/products/womens-daily-focus)
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\ \ Men's Multivitamin\ \ Power-packed nutrition for men.](https://firstday.com/products/mens-provisions-vitamin) \ \ Men's Probiotic+\ \ Support for digestion and muscle recovery.](https://firstday.com/products/mens-gut-guardian) \ \ Men's Magnesium\ \ Helps battle stress at the end of the day.](https://firstday.com/products/mens-calming-magnesium) \ \ Men's Brain Support\ \ Support for memory and brain fog.](https://firstday.com/products/mens-daily-focus)
About Us Our Ingredients Our Science Heavy Metals & Pesticides 2026 Hidden Health Crisis Report Vanishing Nutrients Vitamin Overconsumption Blog Is Your Family Nutrient Deficient?
First Day - Teens' 3-in-1 Pre+ Post+ Probiotic Gummy 3-in-1 For Improved Immunity & Skin Health
100 reviews
ToddlersAges 2 - 3 KidsAges 4 - 12TeensAges 18+
This Product is For Teens Ages 13 - 17
Teen’s tribiotic gummy designed with clinically studied pre+ post+ and probiotics for digestive, immune, and skin health.
Flavor: Natural Golden Peach
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Ingredients
We're thoughtful about our ingredients! We use scientifically studied strains for the most impact on your teen’s gut health.
Livaux® (Prebiotic): Clinically studied prebiotic that helps increase probiotics in the microbiome, promote regular bowel movements, and support the relief of constipation.
SNZ 1969® (Bacillus coagulans Probiotic): Clinically studied probiotic that supports digestion, immunity, and oral health to help fight cavity-causing bacteria.
FloraSMART® (heat-treated Lactobacillus Casei 327 Postbiotic): Clinically studied postbiotic shown to support digestion, healthy skin, and the relief of dry skin.
Other Ingredients: Organic Tapioca Syrup, Organic Cane Sugar, Water, Pectin, Natural Flavors, Citric Acid, Natural Colors.
Free From The Top 9 Allergens: We are dairy-free, soy-free, egg-free, gluten-free, peanut-free, tree nut-free, fish-free, shellfish-free, and sesame-free.
Supplement Facts
Subscription Details
You'll receive a stylish refillable bottle on your first order, then receive our eco-friendly refill pouches every 30 days on a physician-recommended schedule.
Plus, you'll receive these benefits:
- Savings every single month.
- Free shipping on your first order.
- Easy management - skip or pause whenever you need.
- VIP access to sales, gifts, early access & more.
- Cancel anytime.
This Product is For Teens Ages 13 - 17
ToddlersAges 2 - 3 KidsAges 4 - 12
Choose Your Impact
At no extra cost, 1% of every order will be donated to support a nonprofit you choose. Add to cart to choose. Powered by Beam.
To support local nonprofits across the country, First Day will within 90 days make a donation to PayPal Giving Fund (PPGF) an IRS-registered 501(c)(3) charity, to benefit your chosen charity, subject to PPGF’s terms. First Day will cover all applicable processing fees so that 100% of your donation reaches the chosen nonprofit as unrestricted funds. PPGF typically grants funds to recommended charities within 15-45 days. In the rare event PPGF can’t fund the chosen charity, it will reassign the funds to a similar charity. Since the donation is made by First Day, the charity will not receive your information and you will not be entitled to a tax deduction.
Gut Feeling Sus?
Teenagers are hard to understand sometimes, but their diet is no secret. Even when us parents try to feed them fruits & veggies, they just love to eat like garbage (but hey, we’ve all been there!)
Which means their guts may not be in the greatest shape. That’s why we created these tasty gummies with pre+ post+ and probiotics to clean up that sus gut.
Introducing Teen Gut Sustainer – the World’s First Teen Tribiotic!
Real Wholesome®
Real Wholesome®.
Real results you can feel.
No fillers, fake sugars or fad ingredients with wild claims.
Refillable packaging for a healthier planet
Research-backed & clinically proven.
Vegan. Cruelty Free. Non GMO. Free of allergens, artificial colors & flavors.
Tested & loved by picky kids (and adults)
Meticulously sourced for highest quality & safety.
Repeatedly tested for potency & purity.
Three Keys To A Healthy Gut Microbiome
Our powerful 3-in-1 combination of prebiotics, probiotics and postbiotics work together to promote a healthy gut microbiome, which is essential for maintaining good health in teens. A healthy gut microbiome plays a key role in immunity, cognitive function, respiratory health and heart health - and can also help prevent a variety of health issues, including allergies, asthma, eczema and obesity.
Probiotics
Your teen is battling turbulent emotions, embarrassing body changes, and that daunting place known as high school. The last thing they need is gut troubles weighing them down.
Enter SNZ 1969® – the clinically proven probiotic for teens. With scientific precision, it tackles stomach woes, hydrates skin, and supports immunity. Say goodbye to health hurdles and hello to teenage triumphs with SNZ 1969®!
Prebiotics
Your teen's gut needs a gourmet feast to power good bacteria. That’s where the prebiotic powerhouse, Livaux®, comes in to save the day! As the food source of probiotics, Livaux® is clinically proven to support digestive health. It tackles pesky bathroom struggles and helps your teen stay regular.
With Livaux® on their side, your teen can focus more on acing school tests and less on that sus gut!
Postbiotics
The teen’s battle for glowing skin is finally over! Introducing FloraSMART® – the game-changing postbiotic for teens. As the last step in the pre+ and probiotic cycle, postbiotics are crucial to digestion and skin health.
With clinically proven FloraSMART®, your teen's gut health can flourish for radiant skin!
Just The Good Stuff
Packed with key active ingredients to support your health & well-being.
Livaux® (Prebiotic)
250mg
Supports gut health, regular digestion, and a healthy microbiome.
Gut
Immunity
SNZ 1969® (Probiotic)
50mg
Supports digestion, immunity, and oral health.
Immunity
Teeth
FloraSMART® (Postbiotic)
15mg
Supports digestion, healthy skin, and the relief of dry skin.
Skin
Gut
1,000,000+ happy customers
"I love how simple the ingredients are to understand. As a parent, it's a no-brainer !"
Brandi C.
Amarillo, TX
"The kids honestly ask me for their vitamins in the morning. Can you say uhhamazing!!"
Rachel Y.
Montgomery, AL
"Every ingredient in these vitamins are beneficial and the added ingredients have no toxic effect- which is something you don’t find in other brands."
Jamie C.
Ada, OK
"First Day will be part of our morning & night routine for a very long time. So happy I stumbled upon them and LOVE the auto-ship subscription option!"
Kasey L.
Rochester, NY
Formulated For A Healthy Gut Microbiome To Support:
Digestion – Getting your teen to give up junk food may be a battle. But with tribiotics, you can help relieve constipation, bloating, diarrhea, and stomach aches.
Skin Health – Healthy skin starts in the gut! Add tribiotics to skincare routines for glowing, hydrated skin.
Immunity – Make missed school days a thing of the past! A science-based tribiotic supports a strong immune system.
Nutrient Absorption – Supercharge the power of your teen’s daily vitamin! Tribiotics support your gut's ability to absorb nutrients.
Oral Health – Feel confident knowing your teen's next dental visit won't be alarming. With a science-based tribiotic, you can help fight cavity-causing bacteria.
What Sets First Day Apart
Over 1 million families have made the switch to First Day, and it is easy to see why when competitors take so many shortcuts.
Our Scientific Advisors
Dr Lei Chen, MD, MHS
Yale University
A renowned pediatrician who works at Yale University. In 1997, he graduated with his Medical Degree from New York University. He spent his time at the Yale School of Medicine, as well as the Yale-New Haven Children's Hospital. He also graduated with a Masters of Health Science from the Yale School of Medicine in 2010.
Dr. Ed Giovannucci, MD, MPH, ScD
Harvard University
A professor of Nutrition and Epidemiology at the Harvard School of Medicine. In 1984, Dr. Giovannucci graduated with his medical degree from the University of Pittsburgh. He then spent the next 8 years at Harvard, working for his Doctor of Science Degree. Since then, he has climbed to the top of his field.
45 Day Money-Back Guarantee
We're confident this is the best vitamin you'll ever try. But we understand you may be skeptical. So give it a try...worry-free! If you're still not happy, just send it back.
Teens' 3-in-1 Pre, Post, Probiotics FAQs
What's are the ingredients?
We're thoughtful about our ingredients! We use scientifically studied strains for the most impact on your teen’s gut health.
Other Ingredients: Organic Tapioca Syrup, Organic Cane Sugar, Water, Pectin, Natural Flavors, Citric Acid, Natural Colors.
Free From The Top 9 Allergens: We are dairy-free, soy-free, egg-free, gluten-free, peanut-free, tree nut-free, fish-free, shellfish-free, and sesame-free.
Why do you have less than 100% of daily values?
Remember the old adage "more isn't always better"? Many vitamins today use cheap chemicals that our bodies can't absorb in amounts that are much higher than we actually need! In the long term, taking these sorts of vitamins can be harmful to health because our bodies have a tough time getting rid of the excess.
Take plants as an example. Overwatering your plants can damage their roots, wilt the leaves, and ruin their growth. That's why First Day focuses on being a nourishing vitamin filling in the gaps, not overloading you with nutrients.
So, we've consciously formulated our vitamin around what we most commonly lack. Then we made our gummy to fill the gaps in our everyday needs with the finest ingredients.
What else is different about First Day?
We set out by asking the unaddressed questions in the industry. What are supplements really doing for us? Why are they made the way they are?
We found the average multivitamin uses outdated science from 50 years ago.
To separate truth from fiction, our team of experts investigated thousands of clinical studies. That’s why we use the latest science and source the most absorbable ingredients from all around the world so your vitamins are actually working for you and your health.
Should I subscribe if I've never tried First Day before?
Healthy habits are hard to start let alone maintain! We wanted to make it as simple as one-click to building healthy foundations. With your subscription, you get a discount on every order for being a loyal First Day family member! Plus, cancelling a subscription is easy.
For every order, we also have a satisfaction guarantee so you can rest assured knowing we'll always have your back!
Which scientific studies does First Day look at?
Micronutrients, absorption rate, and more! We've combed through the scientific studies so that you don't have to. But if you want to peruse, check out these scientific studies for yourself:
- National Center for Chronic Disease Prevention and Health Promotion, et al. - Vital Signs: Fruit and Vegetable Intake Among Children — United States, 2003–2010
- Department of Molecular Biology, Pusan National University, et al. - Folic acid is necessary for proliferation and differentiation of C2C12 myoblasts
- Austin J Cerebrovasc Dis Stroke - Sulforaphane Protects against Brain Diseases: Roles of Cytoprotective Enzymes
- Department of Pathology, University of Otago, et al. -Vitamin C and Immune Function
- Institute of Human Nutrition Sciences, Warsaw University of Life Sciences - Fruit and Vegetable Intake and Mental Health in Adults: A Systematic Review
- Program in International and Community Nutrition, Nutrition Department, University of California - The challenge to reach nutritional adequacy for vitamin A: β-carotene bioavailability and conversion--evidence in humans
- Vitamin and Mineral Nutrition Laboratory, Beltsville Human Nutrition Research Center - The bioavailability to humans of ascorbic acid from oranges, orange juice and cooked broccoli is similar to that of synthetic ascorbic acid
- Institute of Biochemistry, Life Sciences Center, Vilnius University - Bioavailability of Different Vitamin D Oral Supplements in Laboratory Animal Model
- Institute of Human Nutrition Sciences, Warsaw University of Life Sciences - Tocopherols and Tocotrienols—Bioactive Dietary Compounds; What Is Certain, What Is Doubt?
- Division of Nephrology, RWTH Aachen University - Vitamin K: Double Bonds beyond Coagulation Insights into Differences between Vitamin K1 and K2 in Health and Disease
- National Institute of Health - Vitamin B1 (Thiamine)
- National Institute of Health - Riboflavin Fact Sheet for Health Professionals
- University of Medical Sciences, Isfahan, Iran, et al. - Pyridoxal 5 Phosphate (P5P): Highly Bioavailable Vitamin B6
- Institute of Nutrition and Food Sciences, University of Bonn - Folic acid and L-5-methyltetrahydrofolate: comparison of clinical pharmacokinetics and pharmacodynamics
- Cristiana Paul, MS and David M. Brady, ND, DC, CCN, DACBN - Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms
- National Institute of Health - Biotin Fact Sheet Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms for Health Professionals
- Department of Physiology, School of Medicine, Dokuz Eylul University, et al. - Timeline (Bioavailability) of Magnesium Compounds in Hours: Which Magnesium Compound Works Best
- Human Nutrition Laboratory, Institute of Food, Nutrition and Health, Swiss Federal Institute of Technology - Zinc absorption by young adults from supplemental zinc citrate is comparable with that from zinc gluconate and higher than from zinc oxide
More questions? Find answers on our FAQ page.
Ready to Start Your Health Journey?
Customer Reviews
4.8\ \ 100 reviews\ \ Verified
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Anonymous
Verified
07/14/2026
tastes great and works
son says it tastes great and works
Review for
Teens' 3-in-1 Pre+ Post+ Probiotic
Anonymous
Verified
07/14/2026
These gummies have a good flavor
These gummies have a good flavor. I’m also happy with the quality ingredients.
Review for
Teens' 3-in-1 Pre+ Post+ Probiotic
Nancy
Verified
07/09/2026
Taste approved, helps with allergies
I have two teenage girls, 17 and 13. They like the taste and the product has seemingly helped to thwart seasonal allergy symptoms.
Review for
Teens' 3-in-1 Pre+ Post+ Probiotic
HappyMom
Verified
06/27/2026
Love it!
Daughter loves it and seen some improvements with her moods and energy. I’m looking forward to a more benefits for continued use.
Review for
Teens' 3-in-1 Pre+ Post+ Probiotic
Giancoli
Verified
06/21/2026
Good
Review for
Teens' 3-in-1 Pre+ Post+ Probiotic
1 We offer a 45-day satisfaction guarantee for returns. It covers 45 days starting from the day that you place an order and includes only the very first purchase of any product so that families can try our gummies - for any reason you aren't happy with your vitamins. Please note that we will refund up to $100 so that you can try up to 3 bottles of our gummies risk free. If you would like to order more than 3 bottles in your first order, we recommend that you ordering less so that your family can try them first. Thanks so much for your understanding!
\\ Compared with: Flintstones Vitamins Chewable Kids Vitamins; Nordic Naturals Nordic Berries; SmartyPants Kids Formula
Livaux® is a registered trademark of Anagenix IP Ltd.
SNZ 1969® is a trademark of Sanzyme Biologics Private Ltd.
Suntheanine® is a registered trademark of Taiyo International, Inc.
Cognizin® is a registered trademark of Kyowa Hakko Bio Co., Ltd.
FloraSMART® is a registered trademark of Anderson Advanced Ingredients
Affron® is a registered trademark of Pharmactive Biotech Products, S.L.U.
Zembrin® is a registered trademark of HG&H Pharmaceuticals (Pty) Limited.
Unique IS2 Bacillus Coagulans® is a registered trademark of Unique Biotech Ltd.
OPTIBIOME® is a registered trademark of BIO-CAT, Inc.
OPTIBIOME BS50® is a trademark of BIO-CAT, Inc.
Immuno-LP20 is a trademark owned by HOUSE FOODS GROUP INC.
IMMUSE is a clinically researched lactic acid bacteria developed by Kirin Holdings Company, Ltd.
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