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MEET THE NEXT BIG THING IN KIDS NUTRITION

A New Era of Protein: The 8-in-1 Drink Built for Growing Kids

Growth asks a lot of a small body. One ready-to-pour packet gives kids 6g of protein for growing muscles, bioactive collagen peptides for developing bones, and 4g of gentle fiber, all dosed for ages 4 to 12.

Support Their Growth
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Growth asks a lot of a small body. One ready-to-pour packet gives kids 6g of protein for growing muscles, bioactive collagen peptides for developing bones, and 4g of gentle fiber, all dosed for ages 4 to 12.

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Support Their Growth
45 Day Money Back Guarantee**

A brand new way to meet your kid's protein and fiber needs.

An innovation in sports nutrition. Give your kids the protein and fiber that packaged snacks leave behind — with 6g of protein, 4g of full-spectrum fiber, and one 3-second pour a day. No powders, no clumping, no mess.

6g Protein
6g Protein
4g Fiber
4g Fiber
No Mess
No Mess

Signs They're In A Growing Season

A 4-year-old and a 12-year-old aren't the same kid, and their nutrition shouldn't be either. Growth comes in bursts, and each one asks for more than the last.

Signs They're In A Growing Season

A 4-year-old and a 12-year-old aren't the same kid, and their nutrition shouldn't be either. Growth comes in bursts, and each one asks for more than the last.

New Shoes. Again.

The sneakers you bought in August don't fit by November. When kids are growing that fast, they're building muscle, bone and connective tissue all at once, and that takes protein.

Hungry An Hour After Dinner

A growth spurt often shows up as a bottomless appetite. Protein and fiber together help them feel full between meals, so the next snack isn't the only thing filling the gap.

Growing Fast On A Small Appetite

Some kids grow just as fast while eating like birds. When the plate comes back half full, a drink they already like is the easiest way to get protein and fiber in.

Shot Up, Still Filling Out

Height often comes first and the rest catches up later, which is why a growing kid can look all arms and legs. 6g of complete protein from whey and yeast helps build and support lean muscle while they fill out.

Eating more, mostly out of the snack cabinet

When a growing appetite kicks in, the extra food usually comes from crackers and fruit snacks, not beans and vegetables. Only about 5% of kids meet the fiber recommendation. 4g of gentle, five-source fiber supports healthy digestion and regularity while they eat more.

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Kids' Protein + Fiber + Collagen Protein + Fiber + Collagen 8-in-1 Mix Fuel for Kids

Tear, pour, done. A ready-to-pour liquid packet that disperses instantly in water, juice or sparkling water. No scooping, no clumps, no blender.

Protein for growing muscles Protein for growing muscles
6g

A growing body that trains needs protein for two jobs at once: growing and recovering. One protein source cannot cover fast, sustained and structural needs, so we use three.*

Collagen for growing bones Collagen for growing bones
90%

of bone’s protein is type I collagen. We include collagen peptides to help your child during important growth phases.*

Gentle fiber for a healthy gut Gentle fiber for a healthy gut
4g

4g spread across five gentle, low-FODMAP sources. Fiber is one of the biggest gaps in kids' diets, and it doesn't close on its own as they get bigger.*

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Quantity

15 Servings Per Pack

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10 servings of Electrolyte Drink Mix For The Whole Family.

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First Day - Kids' 3-in-1 Pre+ Post+ Probiotic

First Day - Kids' 3-in-1 Pre+ Post+ Probiotic

To support immunity, digestion, and oral health.

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Support for hydration, focus & balanced energy.

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Ingredients

Bio-Protein Matrix: bioactive collagen peptides (incl. VERISOL®), cell-based cultured protein (S. cerevisiae), whey protein isolate.

Bio-Adaptive Fiber Blend: organic Jerusalem artichoke (Helianthus tuberosus) (tuber) extract, digestion-resistant dextrin, tapioca fiber, partially hydrolyzed guar gum, acacia fiber.

Sweetened with: stevia (Reb M). No added sugar.

Contains: milk (whey). Free from the other 8 major allergens. Gluten-free. Non-GMO.

Other Ingredients: Water, Citric Acid, Natural Flavors. Less than 2% of: Reb M, Beta-Carotene (For Color), Rowanberry Fruit Extract, Mushroom Extract.

Supplement Facts
Supplement Facts
Subscription Details

Receive a fresh pouch of 15 ready-to-pour packets every 30 days.

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.

The Science Behind Growing Strong

How This Helps*

Muscle is built from amino acids, and growing kids need a steady supply. One protein source can't cover every job, so this blend uses three, at a dose sized for a child.

⚡ Whey Protein Isolate for fast-absorbing protein after play.

⏳ Yeast Protein for a steadier, sustained supply.

💪 A complete amino acid profile supports growing muscles.

Three Crucial Components To Support Growing Kids

Growing takes material: protein for muscle, collagen for the frame, and fiber to keep everything running. Most kids' products cover one. We put all three in one packet, sized for a child.

4g
The Muscle

Protein

6g from a complete protein blend with the amino acids growing muscles are made from. Sized for a 4 to 12 year old, where an adult tub pours 40 to 60g.

4g
The Foundation

Fiber

4g spread across five gentle, low-FODMAP sources. Fiber is one of the biggest gaps in kids' diets, and it doesn't close on its own as they get bigger.

Built-In
The Frame

Collagen

Bioactive collagen peptides inside the protein blend, supporting bone development and connective tissue during the years kids grow fastest.

Trusted By Experts and Families Like Yours

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Why Should You Choose First Day?

Active kids usually end up with an adult protein tub in one cabinet and a fiber supplement nobody takes in the other.

First Day
Adult Protein Powders
Protein dosed for ages 3 to 12
4g fiber from 5 sources
Dissolves instantly, no blender
No added sugar
Gluten-free and non-GMO

BEFORE IT BECOMES A PROBLEM

A growing kid’s body is building faster than almost any food routine can keep up with. Protein, fiber and collagen are what it builds from.

Bio-Matched™ formulates for what’s developmentally next — so the foundation is there before it’s tested.