~82% increase in IgA production

E4L Puppy supported a significant increase in Immunoglobulin A (IgA) in developing puppies during a 6-week double-blind, placebo-controlled trial. This represented over 6x greater improvement compared to the control group, demonstrating a meaningful enhancement beyond natural variation.

Why This Matters: Elevated IgA levels play a vital role in building immune defenses, supporting resilience against environmental stressors, and helping protect puppies as their immune systems mature.

~Promotes up to a 4x increase in beneficial gut bacteria (Clostridium hiranonis)

In a controlled study, puppies receiving E4L were compared to a placebo group over a 6-week period using quantitative PCR to evaluate changes in specific gut bacteria. The E4L group demonstrated a substantially greater increase in Clostridium hiranonis, a key bacterium involved in bile acid metabolism and commonly reduced in dogs with gut imbalance.

Why this Matters: C. hiranonis plays an important role in regulating bile acids and maintaining a stable intestinal environment. Supporting its growth is associated with improved microbial balance and more resilient digestive function, particularly during early development.

19.6% better stool scores

An observational trial evaluated the effects of E4L Puppy’s proprietary prebiotic/probiotic blend on the developing gut microbiome and stool quality of growing puppies, measured using the Bristol Stool Scale. Over a three-week period, 26 healthy puppies were randomly assigned to receive either E4L Puppy or a placebo (13 per group).

Why this Matters: Developing puppies often struggle with normalizing stools due to poor gut development and bacteria support during digestion.

~9 out of 10 puppies taking E4L Puppy improved their gut health score within 6 weeks.:

This outcome was observed in a controlled study where puppies receiving E4L were monitored over time using the Canine Dysbiosis Index (DI) from Texas A&M University, a validated measure of overall gut microbiome stability. Puppies began the study with moderate levels of dysbiosis and, on average, showed meaningful movement toward a more balanced microbial state by the end of the trial.

Why This Matters: early-life gut health plays a critical role in immune development, digestion, and long-term resilience. Improvements in the Dysbiosis Index reflect a shift toward a more stable and functional microbiome—helping support better nutrient absorption, reduced digestive stress, and a stronger foundation for overall health as puppies grow.

~E4L delivered a ~34% greater reduction in gut inflammation compared to control in just 3 weeks.:

In a controlled 3-week study comparing puppies receiving E4L to a placebo group, puppies supplemented with E4L demonstrated a significantly stronger improvement in key gut health markers. By week three, the E4L group showed an approximate 52% reduction in fecal calprotectin (fCAL), a well-established marker of intestinal inflammation, compared to roughly an 18% reduction in the control group—representing a ~34 percentage point greater decrease. At the same time, puppies receiving E4L also exhibited a greater increase in Immunoglobulin A (IgA), an essential component of the gut’s immune defense system.

Why This Matters: Gut inflammation affects the foundational health of a puppy. A healthy gut supports more consistent digestion, improved nutrient utilization, and a more stable environment as puppy’s bodies grow and develop.