Fructooligosaccharides (FOS)

Generally Safe FillerNatural

Fructooligosaccharides (FOS) 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 17 supplements in the GoodSupp database. Fructooligosaccharides (FOS) are a type of prebiotic fiber.

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

Safety Verdict: Generally Safe

May cause gas and bloating in some individuals.

What is Fructooligosaccharides (FOS)?

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 (FOS) used in supplements?

It is used as a prebiotic to promote gut health or as a filler.

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 (FOS)?

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

May cause gas and bloating in some individuals.

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

Top-rated products containing Fructooligosaccharides (FOS)

These 17 highest-scoring supplements in our database use Fructooligosaccharides (FOS).

Genestra Brands Genestra Brands HMF Forte Shelf-Stable - Probiotic Supplement - Acidophilus Probiotic & Lactobacillus Acidophilus - Vegan & Gluten Free - 50 Vegetarian Capsules
Genestra Brands Genestra Brands HMF Forte Shelf-Stable - Probiotic Supplement - Acidophilus Probiotic & Lactobacillus Acidophilus - Vegan & Gluten Free - 50 Vegetarian Capsules
Product 100 Brand N/A
Terry Naturally FloraSure Probiotic, 20 billion CFU, 30 Capsules
Terry Naturally FloraSure Probiotic, 20 billion CFU, 30 Capsules
Product 93 Brand N/A
NaturesPlus KalmAssure® Magnesium Powder, Refreshing Pink Lemonade, 0.9 lb (408 g)
NaturesPlus KalmAssure® Magnesium Powder, Refreshing Pink Lemonade, 0.9 lb (408 g)
Product 84 Brand N/A
Intelligent Labs Kids Probiotics & Prebiotics, Wildberry-licious, 60 Chewable Tablets
Intelligent Labs Kids Probiotics & Prebiotics, Wildberry-licious, 60 Chewable Tablets
Product 83 Brand N/A
Probium Probiotics Ten Strain Blend 50B, 50 billion CFU, 60 Vegetarian Capsules
Probium Probiotics Ten Strain Blend 50B, 50 billion CFU, 60 Vegetarian Capsules
Product 83 Brand N/A
Probium Probiotics Multi Blend 12B, 12 billion CFU, 60 Vegetarian Capsules
Probium Probiotics Multi Blend 12B, 12 billion CFU, 60 Vegetarian Capsules
Product 83 Brand N/A
NATURE TARGET Men Probiotics 100Billion CFU with Enzymes Prebiotics Saw Palmetto and
NATURE TARGET Men Probiotics 100Billion CFU with Enzymes Prebiotics Saw Palmetto and
Product 78 Brand N/A
Natural Factors Natural Factors Senior's Multi Probiotic 35 Billion, 30 Vegetarian Capsules, 8-Strain Formula, Designed for the Aging Gut, Restores Intestinal Balance, Proudly Canadian
Natural Factors Natural Factors Senior's Multi Probiotic 35 Billion, 30 Vegetarian Capsules, 8-Strain Formula, Designed for the Aging Gut, Restores Intestinal Balance, Proudly Canadian
Product 68 Brand N/A
FarmHaven Digestive Enzymes with Probiotics and Herbs
FarmHaven Digestive Enzymes with Probiotics and Herbs
Product 67 Brand N/A
POPSTAR POPSTAR Labs Semen Volume Booster - Men's Semen Health & Fertility Supplement - Doctor Formulated to Increase Load Volume - Made in USA - Non-GMO, Organic, Vegan - 120 Capsules (1 Month Supply)
POPSTAR POPSTAR Labs Semen Volume Booster - Men's Semen Health & Fertility Supplement - Doctor Formulated to Increase Load Volume - Made in USA - Non-GMO, Organic, Vegan - 120 Capsules (1 Month Supply)
Product 66 Brand N/A
Natural Factors Natural Factors Ultimate Multi Probiotic 12 Billion, 12-Strain Formula, 60 Vegetarian Capsules, With Added Prebiotic for Long-Lasting Action, Restores Intestinal Balance, Proudly Canadian
Natural Factors Natural Factors Ultimate Multi Probiotic 12 Billion, 12-Strain Formula, 60 Vegetarian Capsules, With Added Prebiotic for Long-Lasting Action, Restores Intestinal Balance, Proudly Canadian
Product 66 Brand N/A
California Gold Nutrition Probiotics with Lactobacillus acidophilus, Bifidobacterium lactis, Lactobacillus plantarum, and Lactobacillus casei, 10 Strain Blend, 25 Billion CFU, 60 Veggie Capsules
California Gold Nutrition Probiotics with Lactobacillus acidophilus, Bifidobacterium lactis, Lactobacillus plantarum, and Lactobacillus casei, 10 Strain Blend, 25 Billion CFU, 60 Veggie Capsules
Product 62 Brand N/A
California Gold Nutrition Probiotics with Lactobacillus acidophilus, Bifidobacterium lactis, Lactobacillus plantarum, and Lactobacillus casei, 10 Strain Blend, 25 Billion CFU, 180 Veggie Capsules
California Gold Nutrition Probiotics with Lactobacillus acidophilus, Bifidobacterium lactis, Lactobacillus plantarum, and Lactobacillus casei, 10 Strain Blend, 25 Billion CFU, 180 Veggie Capsules
Product 62 Brand N/A
NaturesPlus Fruitein High Protein Vegetarian Energy Shake Exotic Red Fruit, 1.3 lbs
NaturesPlus Fruitein High Protein Vegetarian Energy Shake Exotic Red Fruit, 1.3 lbs
Product 59 Brand N/A
NaturesPlus Spiru-Tein®, Protein Powder Meal, Cookies & Cream, 1.15 lbs (525 g)
NaturesPlus Spiru-Tein®, Protein Powder Meal, Cookies & Cream, 1.15 lbs (525 g)
Product 53 Brand N/A
Nucgnex Celnutra 2.0
Nucgnex Celnutra 2.0
Product 50 Brand N/A
Comforts Pediatric Shake Strawberry, 6 Shakes
Comforts Pediatric Shake Strawberry, 6 Shakes
Product 46 Brand N/A
Related Ingredients
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Frequently Asked Questions
Is Fructooligosaccharides (FOS) safe in supplements?

Fructooligosaccharides (FOS) 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 gas and bloating in some individuals. In GoodSupp's database, 17 products contain this ingredient. Consult your healthcare provider if you have specific concerns.

What is Fructooligosaccharides (FOS) 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 17 products in the GoodSupp database.

Is Fructooligosaccharides (FOS) natural or synthetic?

Fructooligosaccharides (FOS) 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.