Constipation is common in children, and many parents look for the best fiber supplement for kids to help. The most important thing to know is that most children do best with more fiber from food and more fluids first. When a supplement is needed, choose one labeled for your child’s age, and talk to your pediatrician first. This guide explains how much fiber kids need and which products are made for them.
Quick answer
The best fiber supplement for kids is one labeled for your child’s age: MaryRuth’s Kids Fiber Gummies (ages 2+, 3 g fiber per gummy) or Benefiber at the children’s dose (1 teaspoon for ages 6 to 11). Adult products like Metamucil powder are labeled for ages 12 and up. Check with your pediatrician before starting any fiber supplement.
Medical note: This guide is general information, not medical advice. Always ask your child’s doctor before giving any supplement, and seek care quickly for pain, blood in the stool, vomiting or a swollen belly.
How Much Fiber Do Kids Need?
| Age | Boys (g/day) | Girls (g/day) |
|---|---|---|
| 12 to 23 months | 19 | 19 |
| 2 to 3 years | 14 | 14 |
| 4 to 8 years | 20 | 17 |
| 9 to 13 years | 25 | 22 |
| 14 to 18 years | 31 | 25 |
Food First: How to Add Fiber for Kids
- Fruit with skins: pears, apples, berries, kiwi, prunes.
- Vegetables at every meal, including peas, sweet potato and broccoli.
- Whole-grain bread, oats and brown rice instead of white versions.
- Beans and lentils in soups, tacos or dips.
- Plenty of water through the day, since fiber needs fluid.
Best Fiber Supplement for Kids: Options by Age
| Product | Labeled ages | Fiber per serving | Notes |
|---|---|---|---|
| MaryRuth’s Kids Fiber Gummies | 2 and up | 3 g per gummy (tapioca fiber) | Sugar-free; sweetener may upset some tummies |
| Benefiber (wheat dextrin) | 6 to 11 at a lower dose | 1 tsp for children 6 to 11 | Dissolves clear in drinks and soft foods |
| Metamucil powder (psyllium) | 12 and up | 3 g per rounded tsp | Younger children only on doctor advice |
| Metamucil Fiber Gummies | 12 and up | 5 g per 3 gummies | Adult product |
Our Picks
1. Best Fiber Supplement for Kids Overall: MaryRuth’s Kids Fiber Gummies
Made for ages 2 and up, with 3 g of tapioca fiber per gummy and no sugar. Start with one gummy, because sugar alcohols and stevia can cause gas or loose stools in some children.
2. Best Powder for School-Age Kids: Benefiber
Wheat dextrin has no taste and dissolves completely, so it can be stirred into milk, juice or yogurt. The label gives a reduced dose for children ages 6 to 11.
3. For Teens: Metamucil or Psyllium
From age 12, adult fiber products such as Metamucil can be used as labeled. See our Metamucil review.
How to Give a Fiber Supplement to a Child
- Talk to your pediatrician first.
- Use a product labeled for your child’s age, at the labeled dose.
- Start with the smallest serving and increase slowly.
- Give extra water, milk or other fluids every day.
- Keep gummies out of reach, as children may treat them like candy.
When to See a Doctor
See your child’s doctor if constipation lasts more than two weeks, or if your child has stomach pain, blood in the stool, vomiting, a swollen belly, weight loss or poor growth, or soiling accidents. In babies under 1, always ask a doctor before changing their diet or giving any supplement.
Frequently Asked Questions
What is the best fiber supplement for kids?
For children, a product labeled for their age is best: MaryRuth’s Kids Fiber Gummies for ages 2 and up (3 g per gummy), or Benefiber at the children’s dose for ages 6 to 11. Always check with your pediatrician first.
What is the best fiber supplement for kids with constipation?
Ask your pediatrician before using any supplement. Often more water, fruit (especially pears, prunes and kiwi) and a regular toilet routine help. If a supplement is advised, use one labeled for your child’s age.
How much fiber does a child need?
US Dietary Guidelines suggest about 14 g a day at ages 2 to 3, 17 to 20 g at 4 to 8, 22 to 25 g at 9 to 13, and 25 to 31 g for teens. A simple pediatric rule is age in years plus 5 grams.
Can kids take Metamucil?
Metamucil powder is labeled for ages 12 and up. Younger children should only take it if a doctor advises it.
Can toddlers take fiber supplements?
Only on a pediatrician’s advice. For toddlers, food sources such as fruit, vegetables, beans and whole grains, plus enough fluid, are the first step.
Are fiber gummies safe for kids?
Gummies made for children and taken at the labeled dose are generally safe. Keep adult gummies out of reach, as children may eat them like candy.
Can Benefiber be given to children?
The Benefiber label gives a smaller dose of 1 teaspoon for children ages 6 to 11. Ask your pediatrician before starting.
When should I see a doctor about my child’s constipation?
See a doctor if constipation lasts more than two weeks, or if there is pain, blood in the stool, vomiting, a swollen belly, poor growth or soiling.
The Bottom Line
The best fiber supplement for kids is often no supplement at all: more fruit, vegetables, whole grains and water fix many cases. When one is needed, pick a product made for your child’s age, start low, and keep your pediatrician involved. For adult options, see our best fiber supplement guide.
References
- Utah State University Extension. Increasing fiber intake during childhood and adolescence (Dietary Guidelines and AAP recommendations).
- Garage Gym Reviews. MaryRuth’s Kids Fiber Gummies details.
- Benefiber Fiber Supplement Powder: directions for adults and children.
- Metamucil Fiber Gummies: product information and ages.
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