Similac® Soy Isomil®

Complete nutrition for sensitive tummies

Fussiness and gas can be a common part of feeding your baby.

Similac Soy Isomil is specially designed to comfort with the gentleness of soy to soothe the tummy.

Soy-based formulas have been clinically shown to help reduce feeding problems. No other soy-based formula has been studied more than Isomil.

Has OptiGRO to support your baby's brain and eye development.

If your baby’s fussiness or gas seems excessive, ask your physician about switching to Similac Soy Isomil.

Soy formulas are not recommended for premature infants with birth weights of less than 1800 g.

Similac Soy Isomil formula product for infants

Available In:

Similac Soy Isomil 1.45lb formula for infants 1.45-lb Powder

Similac Soy Isomil 12.4oz formula for infants 12.4-oz Powder

Similac Soy Isomil 32oz formula for infants 1-qt Ready to Feed

Nutrition Information

Powder / 1.45 lb

Serving size: 100 Cal (prepared as directed)*

Amount per serving

  • Calories:


  • Volume, mL:


  • Protein, g:


  • Fat, g:


  • Carbohydrate, g:


  • Water, g:


  • Linoleic Acid, mg:


Vitamins & Minerals

* Nutrient values are applicable when prepared as directed.

Similac® Soy Isomil®
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Rated 5 out of 5 by from Solved all my problems! My poor baby girl was so fussy with all formula after we switched her from breast milk (couldn’t make enough). Poor little girl would scream for hours with the worst gas. Started the soy formula at 2 weeks & we saw a change in her within the first 24hrs! Thank you!
Date published: 2018-02-07
Rated 5 out of 5 by from LIFESAVER! My baby was breast fed only until she was about 2 and a half months old...had trouble with milk flow so I had to start supplementing, started with PRO-sensitive but she started screaming 24/7! She was not herself, crying so hard and stiffing her body so bad and not sleeping, switched to this soy, now she is such a happy baby and sleeps ALL NIGHT!!!!!! Thank you Similac!!!!!! You have saved us with this formula!!!!
Date published: 2018-01-26
Rated 5 out of 5 by from love it ! I have a whole new baby ! we tried 2 different formulas and she still had the fussiness and gas. withing 24 hours of using the soy she was a brand new happy baby !
Date published: 2018-01-05
Rated 5 out of 5 by from Works for us My DS has a milk intolerance. Breast milk and regular formula would mess with him so bad. He has been so much better since switching to soy
Date published: 2018-01-05
Rated 4 out of 5 by from Happier baby 3mo old exclusive human milk up until 3 wks ago. Started to cry all the time and baby's' stomach was hard. Switched to regular formula but the fussiness continued. finally 10 days ago saw her pediatrician who suggested a milk allergy and to try soy formula. I stopped dairy products and would nurse occasionally but baby mainly ate soy formula. Much better, not as fussy and is able to nap better. My concern is her stool is black like. breast milk its seedy musty yellow. With regular formula its more dense gray like. But this is runny black. none of the other reviews mentioned anything about stool color.
Date published: 2017-12-13
Rated 5 out of 5 by from 6 months old and now so much happier! My daughter was breastfeed from nb-3 months but due to a slight younger tie started in formula. She was on a regular formula and her poor tummy was so bad. She had horrible diapers and screamed 75% of the day. At her 6 mo th check up the dr have us a sample of Soy Similac. We immediately started her on it and saw a change almost immediately. She could sit still longer, she was happy, and didn’t clear a room! Ty!
Date published: 2017-11-28
Rated 5 out of 5 by from Sanity Saver My breast milk came in late because she was born early so we exclusively use formula. We started out on newborn but she was colicky so we switched to sensitive. She was still colicky so our pedi advised us to try Soy and within a day she was a totally different baby. Didn't cry for hours on end and didn't spit up half of her dinner :)
Date published: 2017-11-17
Rated 5 out of 5 by from Who is this perfect 4 month old and what have you done with my baby??? As a new mother I thought the gas pains fussiness and runny stools we're all just a normal part of early infancy for my daughter. I didn't have anything to compare her experience too. A friend of mine who is a retired registered nurse noticed that her symptoms were not in the ordinary and pointed it out to me. After some research we decided to try her out on just soy Isomil. Lactose intolerance never occurred to me. We started the soy as opposed to the Similac Advance and within 48 hours it was like she was a completely different baby. Her stools now look healthy and firm, she's never fussy unless she absolutely need something like a bottle or a diapering, and although I still give her gas drops for the occasional gas pains those have diminished substantially. I'm so glad we tried her on the soy Isomil and took that chance. It has changed her life and made the quality of everything much better.
Date published: 2017-11-13
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