Cosphaderm® Heptiol natural (INCI: 1,2-Heptanediol) is a 100% naturally derived, medium-chain alkanediol. Sourced from sustainable castor oil, it is a clear, odorless liquid that represents a significant advancement in natural multifunctional chemistry. It functions as a high-performance humectant, solvent, and antimicrobial booster.
Key Benefits and Performance
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Universal pH Independence: Unlike organic acids, its antimicrobial activity is not restricted to acidic environments. It remains fully effective across the entire cosmetic pH spectrum, making it a vital tool for neutral or high-pH formulations.
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Potent Synergistic Booster: While it shows good activity against bacteria and yeasts, its true strength lies in its “booster” effect. It destabilizes microbial membranes, allowing other preservatives to work more efficiently and enabling an overall reduction in the total preservative load.
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Emulsion Stabilization: Static light scattering experiments demonstrate that this diol can help stabilize O/W emulsions by reducing droplet size, contributing to a more robust and visually homogenous product.
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Advanced Humectancy: As a C7-chain diol, it provides excellent moisturizing properties, binding water to the skin while offering a sophisticated, non-tacky sensory profile.
Formulation Guidelines
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The “Solubility Ceiling”: Water solubility is limited. Since the recommended usage level is close to the saturation point, formulators should be aware that they are working at the saturation point in purely aqueous systems.
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Synergy Partners: For full-spectrum protection (especially against moulds), it is best paired with partners like Cosphaderm® Magnolia Extract 98 or Cosphaderm® pAS natural.
