Fiber supplements can differ not only in the amount of fiber they contain, but also in their sources, serving size, ingredients, and how they're used. That's why, when choosing a fiber supplement, it's worth looking beyond the claims on the front of the package and checking the nutrition declaration and ingredient list as well.
In this guide we explain what to look for when comparing fiber supplements and how to read the information on a product label.
1. Check how much fiber is in a serving
First, it's worth looking not just at the amount of fiber per 100 g of product, but also at the amount in one actual serving.
For example, a product may have a high fiber concentration per 100 g, but if the recommended serving is small, the amount of fiber you get from one serving will also be smaller.
So when comparing different products, it's useful to check:
- fiber content per 100 g;
- fiber content per serving;
- the recommended serving size;
- how many servings are recommended per day.
This makes it possible to compare different products more accurately.
2. Look at the sources the fiber comes from
The word "fiber" covers a range of different substances. They can have different physical and chemical properties.
Fiber supplements may contain, for example:
Psyllium husk (Plantago ovata seed husk). When it comes into contact with liquid, psyllium husk swells and forms a gel-like mass.
Inulin. This is a type of soluble fiber found naturally in various plants. Food products and supplements use inulin obtained from different plant sources.
Glucomannan. This is a water-soluble fiber obtained from the konjac (Amorphophallus konjac) plant.
That's why it's worth reading the full ingredient list when assessing a product, rather than relying only on a general "fiber" label.
3. Soluble and insoluble fiber are not the same thing
Dietary fiber is often divided into soluble and insoluble fiber.
Soluble fiber can swell or form a more viscous mass when it interacts with water.
Insoluble fiber does not dissolve in water and has different physical properties.
Many plant-based foods naturally contain a mix of different fibers, which is why variety of sources matters in everyday nutrition.
Read more about the differences between these types of fiber in our Fiber Guide.
4. Review the full ingredient list
Two fiber supplements can have a similar total fiber content, yet completely different compositions.
So it's worth checking:
- what the main fiber sources are;
- how many ingredients the product contains;
- whether there are additional ingredients;
- whether the flavor comes from berries, fruit, or other ingredients;
- whether it contains ingredients you want or need to avoid.
Ingredients on a label are usually listed in descending order by quantity, so their order also gives you useful information.
5. Check how the product is meant to be used
Usage recommendations for fiber supplements can vary, so it's important to follow the label of the specific product.
Pay particular attention to the recommended serving size and fluid intake.
Some fibers swell significantly when they come into contact with water, so fiber supplements must be taken according to the manufacturer's instructions and with enough fluid.
If you haven't consumed much fiber until now, it's generally best to increase your intake gradually.
6. Check what lab testing actually confirms
A "lab tested" label alone doesn't tell you what exactly was tested.
Laboratory testing may cover a product's nutritional composition, microbiological indicators, or other properties.
So it's worth looking for specific information: what was tested, using what method, and which sample the results apply to.
It's also important to note that a laboratory analysis of a product's composition does not prove the product's effect on human health.
7. Don't judge a product on wellness claims alone
When choosing a fiber supplement, it's worth being cautious about absolute claims such as "detoxes the body," "melts away kilos," "stabilizes blood sugar," or similar statements.
A supplement's composition and its effect are not the same thing.
It's more practical to evaluate information you can objectively verify: ingredients, fiber content, serving size, nutrition declaration, usage instructions, and lab test data.
8. Consider the packaging and convenience
If you plan to use a fiber supplement regularly, it's worth considering the packaging too.
A larger pack can be convenient for use at home, while a product packaged in individual servings can be more convenient at work or while traveling.
When comparing price, also look not only at the price of the whole package, but also at the amount of product and the number of servings it provides.
How does "fruttberry +fiber" measure up against these criteria?
"fruttberry +fiber" is a plant-based fiber blend with strawberries and blackcurrants.
It contains:
- psyllium husk (Plantago ovata seed husk);
- agave inulin;
- glucomannan;
- freeze-dried strawberries;
- freeze-dried blackcurrants.
100 g of product contains 77 g of fiber, and one 5 g serving contains 3.86 g of fiber and 11 kcal.
Laboratory testing of the tested "fruttberry +fiber with berries" sample found 60.8% soluble and 23.6% insoluble fiber. These laboratory results apply to the specific sample tested.
"fruttberry +fiber" is made in Lithuania.
Which "fruttberry +fiber" pack should you choose?
The fiber blend itself is the same in both cases. What differs is the packaging format and number of servings.
250 g pack
Contains around 50 servings of 5 g each. This format can be convenient for regular use at home.
30-serving pack
Contains 30 individual 5 g sachets. The individual-serving format is convenient to take to work or on trips.
You'll find both options on the "fruttberry +fiber" fiber blends page.
Who should consult a specialist before using a fiber supplement?
If you take medication, have a health condition, or are unsure whether a particular fiber supplement is right for you, it's worth consulting a doctor or pharmacist before use.
"fruttberry +fiber" is not recommended for children, pregnant, or breastfeeding women without consulting a doctor or other healthcare professional.
Always follow the usage and warning instructions given on the label of the specific product.
What matters most to compare?
When choosing a fiber supplement, don't rely on the product name or marketing claims alone.
Compare the amount of fiber per serving, its sources, the ingredient list, serving size, how it's used, and the packaging format.
And if you can already get fiber from vegetables, fruit, berries, legumes, whole grains, nuts, and seeds in your everyday diet, these foods should still remain part of a varied and balanced diet.