Kerabiotics Ingredients — Full List & What the Science Says
Eight ingredients. Each one analyzed for dosage accuracy, biological mechanism, and quality of supporting evidence. This is the most detailed Kerabiotics ingredient breakdown available in 2026.
| Ingredient | Amount | Category | Evidence Level |
|---|---|---|---|
| Lactobacillus acidophilus | 10 Billion CFU | Probiotic | Strong |
| Bifidobacterium longum | 5 Billion CFU | Probiotic | Moderate |
| Bacillus subtilis | 2 Billion CFU | Probiotic | Moderate |
| Caprylic Acid | 300 mg | Antifungal fatty acid | Strong |
| Quercetin | 250 mg | Bioflavonoid | Moderate |
| Biotin (Vitamin B7) | 5,000 mcg | Structural nutrient | Strong |
| Zinc | 15 mg | Mineral | Strong |
| Tea Tree Extract | 100 mg | Botanical antifungal | Moderate |
Detailed Ingredient Analysis
Below is a full breakdown of each ingredient: the mechanism of action, dose assessment, and our evidence rating. We use three tiers: Strong (multiple human clinical trials or well-replicated in-vitro data with clear mechanistic understanding), Moderate (consistent in-vitro evidence or limited human data), and Limited (theoretical or animal-model only).
Lactobacillus acidophilus
10 Billion CFU· ProbioticMechanism: Produces lactic acid and bacteriocins that inhibit Candida albicans adhesion and growth. Studies show L. acidophilus supplementation reduces Candida colonization rates in human subjects.
Primary antifungal probiotic in the formula. Clinically the most studied strain for gut-fungal balance.
Bifidobacterium longum
5 Billion CFU· ProbioticMechanism: Modulates Th1/Th2 immune balance and reduces systemic inflammation. Reduced inflammation correlates with improved fungal clearance at peripheral tissues including nails.
Complements L. acidophilus via immune modulation rather than direct fungal competition.
Bacillus subtilis
2 Billion CFU· ProbioticMechanism: Spore-forming strain that resists stomach acid degradation. Produces antifungal lipopeptides (iturin and surfactin) in the gut that show direct inhibitory activity against multiple fungal genera.
The spore formation means higher bioavailability than many non-spore probiotics. Unique antifungal lipopeptide production.
Caprylic Acid
300 mg· Antifungal fatty acidMechanism: Medium-chain fatty acid (C8) that integrates into fungal cell membranes and disrupts membrane integrity, causing cellular lysis. Particularly effective against Candida species.
Well-established antifungal mechanism. Does not contribute to drug resistance unlike synthetic antifungals.
Quercetin
250 mg· BioflavonoidMechanism: Inhibits fungal ergosterol synthesis and exerts direct antifungal activity. Also reduces NF-κB-mediated inflammation that drives nail bed pathology in chronic fungal infections.
Dual function: antifungal + anti-inflammatory. Bioavailability is enhanced when taken with food.
Biotin (Vitamin B7)
5,000 mcg· Structural nutrientMechanism: Essential cofactor for keratin synthesis. At 2,500–5,000 mcg/day, biotin supplementation has demonstrated increased nail plate thickness, reduced brittleness, and faster regrowth in clinical trials.
One of the most evidence-backed nail health nutrients available. At 5,000 mcg, this is at the therapeutic dose range.
Zinc
15 mg· MineralMechanism: Cofactor for over 300 enzymatic reactions. Zinc deficiency is associated with impaired immune function and increased fungal susceptibility. Supplementation normalizes immune-fungal response in deficient individuals.
At 15 mg elemental zinc, this dose is within the safe therapeutic range (RDA: 8–11 mg, tolerable upper limit: 40 mg).
Tea Tree Extract
100 mg· Botanical antifungalMechanism: Contains terpinen-4-ol (the primary bioactive), which disrupts fungal and bacterial membrane permeability. Systemic absorption of tea tree polyphenols provides antifungal activity at the nail bed.
More commonly studied as a topical, but oral polyphenol absorption from standardized extracts is documented.
Overall Formula Assessment
Kerabiotics scores well on transparency: all eight ingredients are disclosed with specific doses, no proprietary blends obscure what you are actually taking. The ingredient selection is logically coherent — probiotics address the systemic microbiome component, Caprylic Acid and Tea Tree extract provide antifungal activity, and Biotin and Zinc support structural nail recovery.
The critical differentiator versus most nail supplements is the probiotic component. Most competitors focus exclusively on antifungal ingredients and ignore the mounting evidence that gut dysbiosis is a contributing factor in chronic, recurrent nail fungal infections. Kerabiotics appears to be designed by formulators who understand this dual pathway.
For a full review including customer results and verdict, read our main Kerabiotics review. To purchase, visit our buying guide.