Fructooligosaccharides

Generally Safe FillerNatural

Fructooligosaccharides is a naturally derived filler used in dietary supplements. Safety rating: Generally Safe. It is generally considered safe for most people at standard doses. Found in 15 supplements in the GoodSupp database. Fructooligosaccharides (FOS) are a type of prebiotic fiber.

15 Products use this
Generally Safe Safety rating
Filler Category
Yes Natural origin

Safety Verdict: Generally Safe

May cause digestive upset in sensitive individuals.

What is Fructooligosaccharides?

Fructooligosaccharides (FOS) are a type of prebiotic fiber.

Common Names Fructooligosaccharides, FOS
Type Filler
Origin Natural / Plant-derived
Safety Rating Generally Safe

Why is Fructooligosaccharides used in supplements?

They can be used as a filler and to promote gut health.

Role in supplements: Filler — adds bulk to fill capsules or tablets to a standard size. Does not contribute to the supplement's active benefits.

Should you be concerned about Fructooligosaccharides?

Generally no. Fructooligosaccharides is considered safe for most people at typical supplement doses. Some individuals may want to be aware of minor sensitivities.

May cause digestive upset in sensitive individuals.

Low risk. Generally safe for most people in supplement amounts.

Top-rated products containing Fructooligosaccharides

These 15 highest-scoring supplements in our database use Fructooligosaccharides.

Olympian Labs Complete Prebiotic & Probiotic, 30 Vegetarian Capsules
Olympian Labs Complete Prebiotic & Probiotic, 30 Vegetarian Capsules
Product 100 Brand N/A
California Gold Nutrition Digestive Support Probiotic, Probiotic & Prebiotic Blend with Lactobacillus rhamnosus GG, 20 Billion CFUs, 30 Veggie Capsules
California Gold Nutrition Digestive Support Probiotic, Probiotic & Prebiotic Blend with Lactobacillus rhamnosus GG, 20 Billion CFUs, 30 Veggie Capsules
Product 100 Brand N/A
Solaray Chromium Picolinate Lozenges, Natural Lemon-Raspberry, 1,000 mcg, 100 Lozenges
Solaray Chromium Picolinate Lozenges, Natural Lemon-Raspberry, 1,000 mcg, 100 Lozenges
Product 100 Brand N/A
Dr. Morgan Dr. Morgan Women's Probiotic Supplement – 20 Billion CFU, 9 Strains with Prebiotics & Bilberry – Gut Health & Digestive Support – 60 Capsules
Dr. Morgan Dr. Morgan Women's Probiotic Supplement – 20 Billion CFU, 9 Strains with Prebiotics & Bilberry – Gut Health & Digestive Support – 60 Capsules
Product 100 Brand N/A
NOW NOW Supplements, OralBiotic, Developed for Adults & Children, Strain Verified, 60 Lozenges
NOW NOW Supplements, OralBiotic, Developed for Adults & Children, Strain Verified, 60 Lozenges
Product 100 Brand N/A
Bariatric Advantage Chewable Ultra Solo with Iron, Citrus, 90 Tablets
Bariatric Advantage Chewable Ultra Solo with Iron, Citrus, 90 Tablets
Product 94 Brand N/A
Dr. Mercola Biothin® Probiotic, Lactobacillus Gasseri, 250 mg (10 Billion CFU), 30 Capsules
Dr. Mercola Biothin® Probiotic, Lactobacillus Gasseri, 250 mg (10 Billion CFU), 30 Capsules
Product 93 Brand N/A
NOW Probiotic-10 25 Billion
NOW Probiotic-10 25 Billion
Product 93 Brand N/A
Solaray L-Theanine, Natural Lemon-Lime, 200 mg, 30 Chewables
Solaray L-Theanine, Natural Lemon-Lime, 200 mg, 30 Chewables
Product 93 Brand N/A
Bariatric Advantage Chewable High ADEK Multi with Iron, Tropical Fruit, 60 Tablets
Bariatric Advantage Chewable High ADEK Multi with Iron, Tropical Fruit, 60 Tablets
Product 92 Brand N/A
Garden of Life Kids, Probiotics, Strawberry, 60 Gummies
Garden of Life Kids, Probiotics, Strawberry, 60 Gummies
Product 89 Brand N/A
Bariatric Advantage Chewable Advanced Multi EA, Strawberry, 60 Tablets
Bariatric Advantage Chewable Advanced Multi EA, Strawberry, 60 Tablets
Product 88 Brand N/A
Bariatric Advantage Chewable Advanced Multi EA, Mixed Fruit, 60 Tablets
Bariatric Advantage Chewable Advanced Multi EA, Mixed Fruit, 60 Tablets
Product 88 Brand N/A
Bariatric Advantage Chewable Advanced Multi EA without Iron, Mixed Fruit, 60 Tablets
Bariatric Advantage Chewable Advanced Multi EA without Iron, Mixed Fruit, 60 Tablets
Product 88 Brand N/A
Spring Valley Spring Valley Acidophilus & Bifidus 6 Billion Active Cells, 180 Vegetarian Capsules
Spring Valley Spring Valley Acidophilus & Bifidus 6 Billion Active Cells, 180 Vegetarian Capsules
Product 87 Brand N/A
Related Ingredients
Almond Butter Generally Safe Almonds Generally Safe Apple Fiber Safe Broccoli Safe Brown Rice Generally Safe Brown Rice Flour Safe Brown Rice Protein Generally Safe Buttermilk Powder Generally Safe
Frequently Asked Questions
Is Fructooligosaccharides safe in supplements?

Fructooligosaccharides is rated generally safe for most people at amounts commonly found in supplements. While the overall safety profile is favorable, some individuals may experience minor sensitivities. May cause digestive upset in sensitive individuals. In GoodSupp's database, 15 products contain this ingredient. Consult your healthcare provider if you have specific concerns.

What is Fructooligosaccharides and why is it in my supplement?

Fructooligosaccharides (FOS) are a type of prebiotic fiber. As a filler, it adds bulk to capsules or tablets to achieve a standard size without affecting the active ingredients. It appears in 15 products in the GoodSupp database.

Is Fructooligosaccharides natural or synthetic?

Fructooligosaccharides is naturally derived, meaning it comes from natural sources such as plants, minerals, or animal products rather than being chemically synthesized. Natural-origin ingredients are preferred by many consumers, though it's important to note that 'natural' does not automatically mean 'safer' — safety depends on the specific substance, its purity, and the amount used. The safety rating assigned by GoodSupp is based on the ingredient's actual safety profile, not its origin.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.