Your kid's multivitamin could be causing more harm than good
Join over half a million parents who've switched to First Day, the safe and effective vitamin that kids love!
“My son was a picky eater and finding a way to get his nutrients was a struggle. He would act out and have difficulty listening. Now, not only has his attitude changed, but he is also eating better!”
5 Red Flags of Dangerous Multivitamins
Folic Acid (prefer Methylfolate)
A lot of vitamins offer folate (vitamin B9) in the form of folic acid, but this chemically synthesized version is a double-edged sword:
On one hand, 40% of people can't properly absord this form of folate¹, which can make it useless as supplement.
On the other hand, in high doses it can might cause side effects like upset, stomach upset, nausea, confusion and more².
The solution: methylfolate (short for L-methyltetrahydrofolate) is the natural form of folate used in First Day vitamins. Although more challenging to source as an ingredient, it is better absorbed and more effective as a supplement!³
Monkfruit Extract (prefer natural sugars)
Hailed as a 'healthy alternative to sugar', monkfruit extract has gained popularity as a low calorie sweetener.
However, monkfruit is 100 to 250x sweeter than table sugar!⁴ This intense sweetness can change taste perception, making naturally sweet foods seem less appealing.
Artificial sweeteners like this are also associated with increased risk to develop obesity, metabolic syndrome, and type 2 diabetes.⁵ They simply lack long term studies to back its safe use.
The solution: sugar is not a villain when used in low quantity and sourced naturally. With only 2g, our gummies help kids adhere to a healthy habit with no side effects of excess sugar.
Sodium Benzoate (prefer buying fresh)
This is a common preservative used to prevent bacterial growth.
However, it can react with vitamin C to form benzene, a cancer-causing chemical.⁶
Ingestion of sodium benzoate in large quantities is also linked to difficulty concentrating in children, with a reported increased hyperactivity.⁷
The solution: buy fresh! First Day doesn't use preservatives to extend the shelf life, we make sure to have just enough vitamins for our orders instead of stocking up.
Red Dye 40 (avoid it)
It is used to give food, drinks, makeup and medicine a bright red color.
However, research has linked Red Dye 40 to symptoms like migraines, difficulty concentrating, and allergic reactions such as hives.⁸
The FDA has recently banned Red Dye 3 in the U.S. (January 15 of 2025).⁹ Although Red Dye 40 is still approved, several European have banned the ingredient due to these health concerns. With all these signs, it's just better not to wait.
The solution: there is simply no need to use artificial colors and flavors in vitamins. With the right formula we figured out a way to make gummies that are healthy and kids love - it's tasty, fun and has a nice texture.
Oversupplementation (avoid it)
Don't be fooled by labels with "100% daily value" or even higher - more isn't always better!
Too much of certain vitamins will either go to waste or can actually be harmful to your kid's health.
For example, too much Vitamin D can actually weaken bones and create kidney stones.¹⁰ Too much Folate can have a negative impact in neurodevelopment and risk of carcinogenesis.¹¹
The solution: we've consciously formulated our vitamin around what kids most commonly lack, finding the right balance between effectiveness and safety.
We Worked Hard to Create A Better Vitamin ‒ Without Any of The Bad Stuff
Meet First Day, the Science‒Driven Gummy Vitamins Redefining Kids' Nutrition
Made to Fight Hidden Hunger
Hidden hunger is a term used to refer to nutrient deficiencies, a common issue among kids today.
Our gummies are packed with the nutrients many children lack, helping to fill gaps in their diet and support growth, focus, and energy—all in a way kids enjoy.
Developed Alongside Harvard and 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
Our multivitamin isn’t just a blend of ingredients—it’s a formula built on cutting-edge science. We went through:
5 years of development
35,000 clinical studies
17 prototypes
From the latest studies to carefully measured doses, each gummy reflects the best of modern nutritional science.
Pediatrician Approved
Recommended by pediatricians, our multivitamin is designed to meet the unique needs of growing children, ensuring they get the support they need from a trusted source.
Clean Label Project Certified
Our products have been independently tested by the Clean Label Project for harmful chemicals like heavy metals, pesticides, and plasticizers, and meets their standards for purity and 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 kids, providing safe and effective support without risking overuse or unwanted additives.
Approved by Parents. Backed by Pedriaticians.
We created a formula that has made a significant difference in mood, sleep, digestion, and overall behavior.*
Parents and doctors agree—our vitamins make a real difference in kids' health.
"When I choose vitamins, I consider their quality and safety records, ingredients, dosage, and testing protocol. First Day has created an excellent supplement for children."
Leann Poston M.D, M.Ed, MBA, Pediatrician and Medical Educator
82%
of customers saw an improvement in their child's overall moodiness, irritability & sleep.*
97%
of customers Prefer First Day over other vitamin brands*
88%
of customers saw improved digestion from their child taking the Kids' Multivitamin and Probiotic together*
82%
of customers saw an improvement in their child's overall behavior.*
Over 600,000 Parents Are Helping Their Kids Reach Their Full Potential
Scientifically designed to fight nutrient deficiencies that can lead to behavioral problems and picky eating.*
Experts Love Us!
Our scientific mentors are leading doctors, scientists, and most importantly parents. They help guide First Day's mission to build a better future for families everywhere.
Dr. Ed Giovannucci, MD, MPH, ScD
HARVARD UNIVERSITY
Dr. Giovannucci is 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.
Dr. Lei Chen, MD, MHS
YALE UNIVERSITY
Dr. Chen is 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.
Alice Li, Founder
"I truly believe in our mission of bringing better health to families."
After learning about the massive amounts of sugar that were in typical kids multivitamins, I built a list of 198 Harvard and Yale nutritionists, pediatricians, and professors. From there, two of the top researchers at Harvard and Yale agreed to help!
I explained my story to them, how I wanted to help parents, and what I found about the vitamin industry. And they were a huge help in creating this breakthrough in kids nutrition.
That's why we’re so confident First Day will help you get the results you want. If within the first 45 days you find yourself not completely satisfied, we’ll give you your money back - no questions asked.**
Check all sources mentioned:
¹MTHFR Gene Polymorphisms Prevalence and Cardiovascular Risk Factors Involved in Cardioembolic Stroke Type and Severity. https://pubmed.ncbi.nlm.nih.gov/32722170/
²Uncovering the Hidden Dangers and Molecular Mechanisms of Excess Folate: A Narrative Review. https://pubmed.ncbi.nlm.nih.gov/37960352/
³Scaglione F, Panzavolta G. Folate, folic acid and 5-methyltetrahydrofolate are not the same thing. Xenobiotica. 2014 May;44(5):480-8. https://pubmed.ncbi.nlm.nih.gov/24494987/
⁴Aspartame and Other Sweeteners in Food. https://www.fda.gov/food/food-additives-petitions/aspartame-and-other-sweeteners-food
⁵Metabolic effects of non-nutritive sweeteners. https://pubmed.ncbi.nlm.nih.gov/26095119/
⁶https://www.webmd.com/diet/what-to-know-about-sodium-benzoate
⁷Food additives and hyperactive behaviour in 3-year-old and 8/9-year-old children in the community: a randomised, double-blinded, placebo-controlled trial. https://pubmed.ncbi.nlm.nih.gov/17825405/
⁸Silva MM, Reboredo FH, Lidon FC. Food Colour Additives: A Synoptical Overview on Their Chemical Properties, Applications in Food Products, and Health Side Effects. Foods. 2022 Jan 28;11(3):379. doi: 10.3390/foods11030379. PMID: 35159529; PMCID: PMC8834239. https://pubmed.ncbi.nlm.nih.gov/35159529/
⁹https://www.fda.gov/food/hfp-constituent-updates/fda-revoke-authorization-use-red-no-3-food-and-ingested-drugs
¹⁰Vitamin D Toxicity. https://www.ncbi.nlm.nih.gov/books/NBK557876/
¹¹Uncovering the Hidden Dangers and Molecular Mechanisms of Excess Folate: A Narrative Review. https://pubmed.ncbi.nlm.nih.gov/37960352/
**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!
*Based on a survey of First Day customers
*These statements have not been evaluated by the Food and Drug Administration.
This product is not intended to diagnose, treat, cure or prevent any disease.