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A mix of multicolored medical soft gel capsules


The development of oral drugs presents several challenges, including low solubility, instability of the formulation and ineffective delivery of the IFA. The selection of the correct oral excipient during the initial stage of development is a critical step in achieving the success of the formulation.

vitamins and supplements

Croda's Super Refined™ technology produces high-purity excipients, which provide several benefits in a formulation for oral drugs. These benefits include

  • increased stability of the drug
  • improved stability in gelatin capsules
  • less impact of taste, odor and color.

As a result, they optimize the bioavailability of the drug and its shelf life, increase patient compliance and reduce the development, decreasing the time to market.

Taste of excipients can be a big problem in oral formulation. Do you do anything to mitigate this?

Super Refined excipients have minimal taste compared to their standard pharmaceutical equivalent grades, resulting in more palatable patient medicines. To demonstrate this, our Super Refined excipients and their standard pharmaceutical equivalent grades were tested by a panel of trained taste specialists (Sensory Spectrum, Inc.) to quantitatively identify the degree of difference in taste. The Degree of Difference (DOD) scores ranged from 0-10, with 0 indicating no difference and 10 indicating an extreme difference. A DOD of 5 or higher indicates that consumers will be able to perceive a difference in taste, while a DOD of 4-5 indicates a consumer might perceive a difference in taste.

The chart shows that the DOD between Super Refined Polysorbate 80 and its Polysorbate 80 NF benchmark was assigned as 8, indicating that Super Refined Polysorbate 80 has a consumer perceivable taste difference compared to its compendial grade. This has also been shown to be the case with other Super Refined excipients, supporting their use in formulating more palatable oral liquid dosage forms in order to improve patient compliance and outcomes.
Degree of difference (DOD) scale diagram

test tube and flask in medical chemistry

Pharmaceutical solubility guide

As API solubility continues to present challenges for the pharmaceutical formulator, Croda has determined the solubility of a range of actives in a number of Croda’s high purity excipients.

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Mother carefully applying medical ointment


Our extensive experience in skin science has led to the development of innovative ingredients that enhance the efficacy and patient perception of topical pharmaceuticals. Our topical excipients include drug delivery systems, skin penetration enhancers, solubilisers, emulsifiers and emollients.

Doctor giving a senior woman a vaccination.


The formulation of parenteral and injectable dosage forms present unique challenges in comparison to other administration routes.

man using eye drop

Auricular, ophthalmic and nasal

Developing drugs to be delivered through the ophthalmic, auricular and nasal routes requires focus on essential factors, such as drug stability and endotoxin levels, which can impact the success of the formulation.

Super Refined™ Excipients

Discover our Super Refined™ range

Many lipid and surfactant ingredients have an inherent taste to them, which can make delivering oral solutions difficult to patients, especially children. Our ingredients have been shown to have a milder taste than other standard compendial versions in the market, ultimately improving patient compliance.
Discover our Super Refined™ range