header_search header_signed-out header_signed-in header_cart sharefilled circlex
Added to Cart
Cart Total:
Customers Also Bought:
24/7 Help

Source Naturals, FOS Powder, 7.05 oz (200 g)

$18.19 $18.19 (Saved $7.79)

Thank you!

Your email is being processed.

Source Naturals, FOS Powder, 7.05 oz (200 g)

Click to zoom
Our Price:
You Save:
$7.79 (30)
Quantity Discount:
Buy 3+
(5% off)

Sorry, this product is no longer in stock.

Earn 5% Loyalty Credit ?
Combo Discount

Sorry, this product is no longer in stock.

Source Naturals, FOS Powder, 7.05 oz (200 g)

In Stock
  • Expiration Date: March 2019
  • Shipping Weight:
    0.65 lbs
    Switch to Metric units
  • Product Code: SNS-00578
  • UPC Code: 021078005780
  • Package Quantity: 7.05 oz
  • Dimensions:
    5.8 x 3.1 x 3.1 in, 0.55 lbs
    Switch to Metric units

Product Rank:

#80 in Probiotics >
Frequently Purchased Together
Product Overview


  • Dietary Supplement
  • (Fructooligosaccharides)
  • Probiotic Enhancer

Source Naturals FOS is a complex of fructooligosaccharides (FOS) - a group of naturally occurring carbohydrates that can help promote the growth of beneficial flora in the gastrointestinal tract. The body normally maintains a balance of "friendly" flora in the intestines; unfortunately factors such as improper diet, stress, gastrointestinal problems, and use of antibiotics may disrupt this delicate balance. FOS are long chain sugars that are indigestible by humans, but serve as "food" for friendly flora helping to increase their numbers in the body. Scientific research conducted in Japan has shown that FOS are selectively used by friendly flora such as bifidobacteria and lactobacilli.

Suggested Use

1 rounded teaspoon daily, mixed in water or juice as desired.

Other Ingredients

Suitable for vegetarians and hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives, or artificial color, flavor or fragrance.


Store in a cool, dry place.

Note: If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.

Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.

Supplement Facts
Serving Size: 1 Rounded Teaspoon (approx. 3.3 grams)
Servings Per Container: 60
  Amount Per Serving /strong> %DV
Total Carbohydrate 3 g <1%*
Dietary Fiber 3 g 10%*
Sodium 15 mg 1%
Fructooligosaccharides (FOS) 3.3 g
* Percent Daily Values (%DV) are based on a 2,000 calorie diet.
† Daily Value not established.
iHerb Customer Reviews

fos helped my difficult breathing get better, & restored normal bowel movement that was too loose & that i lost control of

Posted by iHerb Customer on November 28 2017 | Verified Purchase

peace, i've used this product many years ago, but became unavailable in local stores & online, in fact all fos products disappeared by all brands. when i 1st utilized this product it seems like 15 years ago or so, i had constant loose bowels ever since the doctor had me do 3 types of anti-biotics for 1 month & it was discovered i have a life long injury of a worn out completely cartilage between lumbar vertebrae so they rub bone on bone, painful, that now can't grow back once all gone, waited 10 years too long to see a doctor as to hazards from my heavy lifting laborious job for decades. so anytime i lift even the lightest object my bowels would go, in research about what pro-biotics are that was told me when i went back to doctors office when finished the 1 month of anti-biotics, i was told in a soft barely audible tone that now i need to do pro-biotics the rest of my life daily, not knowing about this stuff, researched pro-biotics on internet. claimed fos (fructooligosaccharides) is what the good breathing bacteria need as food, a carbohydrate in plants with jerusalem artichokes having the most, that i believe the product claimed is made of. & i need to take it along with the pro-biotics so they can survive the journey through the stomach acid into the upper intestinal tract where they live. so finding the product again because the problem has flared up, it seems a new prescription to help my breathing from toxic particles substance breathed in daily for decades on the job kept getting worse, difficult breathing in cold, just crossing a room, didn't read the paper work that comes with prescription cause too stressed, so when able i read it had dairy, i am allergic to dairy & am a vegan, it seemed caused the loose bowels, being a vegan following doctors advice on proper nutrition to keep my injury from worsening, that also came about from lack of proper nutrients daily. but on the fos bottle it said california found product to cause birth defects & cancer, i took it as a fraud, probably some company competing, but haven't been able to afford any pro-biotics yet, hope to before i use it up. my bowels have gotten better a little, but have been carry weight that counter acts any help, can't get out of carry what is need for daily living. in past just doing this product, i was told will multiply the good breathing bacteria 3 to 4 times their amount, & it would restore normal bowel movemengt by itself, & it did, & also helped my breathing that was very difficult, like a miracle.

Thanks for your feedback!

It works !!

Posted by 5 percent off C E M 8791 on November 12 2017 | Verified Purchase

I like to take FOS if I feel like I have eaten something to rich . It seems to help with full.

Thanks for your feedback!

This is a food for Probiotics in our coli , it can support Probiotics survive in our coil.

Posted by My Page on August 23 2017 | Verified Purchase

since I am take 1 teaspoon in my drink per day , it is really improve my digestive system Health. However, I have more relevant experience, we can enter my page (Just click My Page) to share, you will certainly be interested.

Thanks for your feedback!

won't order again

Posted by iHerb Customer on May 24 2014 | Verified Purchase

don't need this product.

Thanks for your feedback!


Posted by Jaycee on April 4 2014 | Verified Purchase

Seems to work well

Thanks for your feedback!