The World's First Pre+ Post+ Probiotics | First Day
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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)
MenAges 18+
\ \ 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?
gut health
Fortify your gut's microbiome with our unique combinations of prebiotics, postbiotics and probiotics. Formulated to help improve immunity and overall gut health.*
Shop 3-in-1 Probiotics
Think Beyond The Gut
Probiotics
Probiotics are a healthy type of bacteria that live in the gut. They not only aid with digestion, but also improve overall immunity. Probiotics also aid in oral health, by helping to fight plaque, gingivitis and cavity-causing bacteria.*
Prebiotics
Prebiotics are a type of "food" for probiotics, helping them flourish & recover. When probiotics are thriving, they can help regulate bowel movements, support immunity, and maintain healthy skin health.*
Postbiotics
We include postbiotics, a natural byproduct of probiotics, to help maintain a healthy immune response. Studies have shown an increased antibody response to seasonal illnesses, as well as a decrease in symptoms from the common cold!*
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