Similac Soy Isomil Lactose-Free Plant-Based Infant Formula | 12.4 oz

Not every baby thrives on cow's milk-based formula — and for those who don't, the answer isn't always a specialty medical formula. Similac Soy Isomil® is a complete, plant-based soy infant formula clinically shown to reduce fussiness and gas when switching from milk-based options. It's the trusted choice for parents managing lactose sensitivity, galactosemia, or a preference for a non-dairy feeding option — without compromising on complete infant nutrition.

Key Features & Benefits

• Clinically Shown to Reduce Fussiness & Gas: Clinically demonstrated to reduce gas and fussiness in infants who don't tolerate cow's milk-based formula — a reliable, well-studied dairy-free alternative.
• Complete Lactose-Free & Dairy-Free Nutrition: Entirely free of lactose and dairy-derived proteins — appropriate for infants with lactose intolerance, galactosemia, or families choosing a plant-based feeding approach.
• DHA & ARA for Brain & Eye Development: Essential fatty acids that support healthy brain and visual development through the entire first year — even without dairy as the protein base.
• Lutein for Eye Health: Contains lutein, an antioxidant naturally found in breast milk that supports healthy eye development — rarely included in soy-based competitors.
• Iron-Fortified for Healthy Development: Meets AAP-recommended iron levels to support cognitive development and prevent iron-deficiency anemia.
• 2-Pack & 6-Pack Savings: Consistent supply for the formula your dairy-sensitive baby actually tolerates.

Technical Specs

• Age Range: 0–12 months
• Can Size: 12.4 oz powder
• Protein Type: Soy protein isolate
• Lactose: Free
• Dairy: Free
• Key Nutrients: DHA, ARA, Lutein, Iron, vitamins & minerals
• Manufacturer: Abbott / Similac
• Available Quantities: 2-pack ($39.99) | 6-pack case ($119.99)

Is Similac Soy Isomil appropriate for a baby with cow's milk protein allergy?

Similac Soy Isomil is appropriate for lactose intolerance and galactosemia, but is NOT recommended as first-line treatment for cow's milk protein allergy (CMPA). Studies show up to 50% of CMPA infants also react to soy protein. For confirmed CMPA, a hypoallergenic formula like Similac Alimentum or Enfamil Nutramigen is the clinical recommendation.

What is the difference between Similac Soy Isomil and Similac Pro-Sensitive?

Similac Pro-Sensitive is a reduced-lactose, cow's milk-based formula for lactose sensitivity. Similac Soy Isomil is completely lactose-free and dairy-free using soy protein. If your baby needs to avoid dairy entirely — not just reduce lactose — Soy Isomil is the correct choice.

Can I use Similac Soy Isomil for a vegan or plant-based feeding preference?

Yes. Similac Soy Isomil contains no animal-derived proteins, making it an appropriate option for families following a vegan or plant-based lifestyle who want a nutritionally complete, iron-fortified soy-based infant formula from 0–12 months.

You May Also Consider

• Similac 360 Total Care Sensitive — If your baby needs reduced lactose but not a full dairy-free formula, this sensitive option with 5 HMOs may be sufficient.
• Similac Alimentum with HMO — If cow's milk protein allergy is suspected, this extensively hydrolyzed hypoallergenic formula is the next clinical step.
• Kate Farms Pediatric Peptide 1.0 — USDA organic, plant-based, top-9 allergen-free formula for children 1+ who need a clean, dairy-free and soy-free option.