Preferred by 1,000,000+ Families Worldwide

The Science-Backed Vitamin for Growing Kids Who Don't Get Enough Nutrients.

The only bio-matched multivitamin formulated specifically for kids with 9 nutrients & 21 superfoods to support growing bones, behavior, and immunity.

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5,000+ Reviews

"Very happy with these vitamins!! They really seem to helping us with my teen's energy, sleep and her all‒around attitude is so much better!"

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The only bio-matched multivitamin formulated specifically for kids with 9 nutrients & 21 superfoods to support growing bones, behavior, and immunity.

Unlock Better Nutrition 💪
5,000+ Reviews

"Very happy with these vitamins!! They really seem to helping us with my teen's energy, sleep and her all‒around attitude is so much better!"

Save Up To 52% Off w/ 4 Free Gifts

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Improve Your Family's Health + Unlock Up To 4 FREE Gifts!

Personalized daily gummy bundles to start your family's day with an edge. Including nutrients shown to support mood, focus, reduce sick days, and sleep through the night to be ready for whatever the day brings.

Reduce Sick Days Reduce Sick Days
95%

of parents say First Day vitamins support their child's overall health & immunity.†

Did You Know: A study from the U.S. Department of Education showed that students who were regularly absent due to reasons like sick days were much less likely to read at grade level.

Enhance Focus & Performance Enhance Focus & Performance
86%

said it was effective in supporting overall school performance or structured learning.

Balance Energy & Get Well-Rested Balance Energy & Get Well-Rested
90%

agree that First Day is better than other sleep support solutions they have tried.

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🎁 4/4 Free Gifts

100% Money Back Guarantee

Less than 1% of First Day customers claim our Money-Back Guarantee!

First Day Subscription Benefits

  • Special discounts & early product access!
  • Renews every 4 weeks. Delay or cancel anytime.
  • Adjust your delivery frequency as needed in your account.

We recommend a subscription so that you can experience a variety of First Day's clinician recommended products.

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Growth Support

How This Helps

92% of kids don’t get enough vitamin D3 — a nutrient their bodies need to absorb calcium and support growing bones. During adolescent years, growth plates open, creating the areas where new bone is formed. But they don’t stay open forever. That makes proper nutritional support during this window especially important.

🦴 Vitamin D3 - Supports healthy bones during a critical stage of growth*

🧬 Folate (B9 / methylfolate) - Supports DNA synthesis and cell growth*

🧠 Vitamin B1 (Thiamine) – supports development of the nervous system*

What You Can Expect Noticeable Benefits Over Time

  1. Stronger Daily Nutrition
    7 Days

    Stronger Daily Nutrition

    Supports essential nutrients for growth, energy, and everyday wellness—helping kids feel their best from the start.

  2. Steadier Mood
    30 Days

    Steadier Mood

    With added nutrients such as B12 and B6, kids have their energy levels balanced, making them more comfortable and on track every day.

  3. Healthier Eating Habits
    60 Days

    Healthier Eating Habits

    When your child feels better after having their nutrition gaps filled, they start to make healthier eating choices.

Target 6 Symptoms of Nutrient Deficiencies with Just 2 Daily Gummies

Target 6 Symptoms of Nutrient Deficiencies with Just 2 Daily Gummies

Stunted Growth

Vitamin D3 and Vitamin K2 work together to support bone development, while essential nutrients like B vitamins help the body turn food into growth-fueling energy.
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Stress & Mood Swings

With Vitamin B6 for mood regulation and Vitamin B12 for energy balance, these gummies help support emotional stability.*

Difficulty Concentrating

With Vitamin B2 for focus support and Vitamin B1 for brain health, these gummies help kids stay focused and attentive, supporting cognitive function and clarity.*

Sugar Cravings

Vitamin C and Vitamin B6 contribute to balanced energy levels, which can help reduce the body’s cravings for quick energy sources like sugar.*

Poor Sleep Habits

Vitamin D3 and Magnesium work together to encourage restful sleep, so kids wake up refreshed and ready to conquer their goals.*

Picky Eating

Vitamin A and Vitamin B9 support cell growth and development, helping to fill in nutritional gaps that teens may have when they only want junk food or continue to skip meals.*

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45-Day Money Back Guarantee

Life Changing Results from Doctors and Real Customers

Dr. Lei Chen

"These vitamins are exactly what I recommend to parents looking for quality nutrition."

Dr. Lei Chen

MD, MHS at Yale University

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Diana V.

"These are the best tasting vitamins I ever purchased. It feels like I am having a treat. These are the only ones so far that my kids like too."

Diana V.

Verified Purchaser

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"A revolutionary approach to children's health."

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Dr. Ed Giovannucci

"We choose partners carefully, and First Day’s dedication to research, formulation integrity, and transparent quality practices makes them a brand we’re proud to align with."

Dr. Ed Giovannucci

MD, MPH, ScD at Harvard University

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of parents see improved health & wellness

0%

of kids ask for their vitamins daily

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customer satisfaction rate

Benefits You Don't Want To Miss Out On

We've crafted a formula specifically for kids ages 4–12, using carefully selected vitamin forms their bodies can actually absorb. No artificial sweeteners, no megadosing, no shortcuts.

Our ingredients are chosen to close the nutrient gaps that show up in real kids with real diets, the picky eaters, the chicken nuggets every meal, the kids who won't touch a vegetable.

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- Leann Poston M.D, M.Ed, MBA, Pediatrician and Medical Educator

"When I choose vitamins, I consider their quality and safety records, ingredients, dosage, and testing protocol. First Day has created an excellent supplement for teens."

- Leann Poston M.D, M.Ed, MBA, Pediatrician and Medical Educator
Behavior

Behavior

Methylfolate and Vitamin B6 support the neurotransmitter production that helps kids regulate emotions and reactions.*

Focus & Attention

Focus & Attention

Vitamins B1, B2, and B6 support brain signaling, nerve function, and the cognitive pathways needed to stay on task.*

MTHFR & Folate Support

MTHFR & Folate Support

First Day uses methylfolate, not folic acid — the bioavailable form that works for all kids, including the 40% whose bodies can't convert folic acid.*

Why We Are the Top Multivitamin

mens multivitamin nutrition

Why We Are the Top Multivitamin

Fights Hidden Hunger

80% of children don't eat enough fruits and veggies, contributing to a nutrient deficiency known as hidden hunger. Our gummies fight hidden hunger with essential nutrients critical to development.

Developed Alongside Harvard & Yale Scientists

Our product was crafted with input from leading scientists at Harvard and Yale, combining the latest research with high-quality ingredients to deliver a multivitamin parents can trust.

Backed by Modern Science

Vitamin B6 supports natural energy regulation, promoting healthier sleep patterns and making it easier for kids to get restful sleep.*

Pediatrician-Approved

Recommended by pediatricians, our multivitamin is designed to meet the unique needs of your family ensuring they get the support they need from a trusted source.
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Clean Label Project® Purity Award

Our products were independently tested by Clean Label Project® for harmful chemicals like heavy metals, pesticides, and plasticizers, exceeding typical industry practices.

Ingredients Sourcing and Dosage

We source each ingredient with care, choosing only the highest quality vitamins and minerals. Our dosage is tailored for teens, providing safe and effective support without risking overuse or unwanted additives.

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45-Day Money Back Guarantee

Why Should You Choose First Day?

Made for modern families living on modern diets, we’re here to fill the nutrition gaps that today’s food often leaves behind.

First Day
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Research Backed
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Vegan, Gluten-Free, Non-GMO
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45 Days
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