Unit quiz: Formulation, ingredients, and applied judgement: from base to decision

Check understanding, separately from reading

5 questions · 80% to pass · no timer. This quiz checks the lessons in this unit. These authored questions assess recognition and application of the taught distinctions, not professional qualification. You may review the lessons and retry. Repeat attempts reuse the question bank; a remembered answer is not proof of transfer to a new situation.

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Question 1

A learner compares an ointment that improves measured hydration and a lotion that she will actually apply twice daily. Which formulation judgement follows from the vehicle evidence?Occlusion improves hydration, penetration and contact time while making a product greasier and harder to spread, so vehicle choice depends on site, washes per day and whether the product will be used consistentlyThe ointment is better because greater occlusion always delivers more of the active, so tolerability is only a cosmetic preference

Question 2

A learner with eyelid dermatitis reads that methylisothiazolinone reacted in 12.2 per cent of patch-tested patients while paraben mix reacted in 1 per cent, and decides to buy paraben-free products. Two of the replacements are preserved with isothiazolinones. What is the best analysis?Buying paraben-free is still the safer choice because parabens carry a hazard signal while the replacement preservatives carry noneThe substitution moves her toward the more frequently sensitising preservative in the dataset, so the change is not automatically safer; identifying her own sensitisers requires clinical patch testing rather than label avoidance

Question 3

A peptide serum claims to relax expression lines through a muscle-relaxing mechanism, and cites a 45-participant study showing reduced wrinkle depth over eight weeks. What is the correct appraisal?The outcome and the mechanism are separate claims: the peptide is described as hydrophilic and relatively large with limited stratum corneum permeability, so dermal delivery is challenging and the neuromuscular claim remains uncertain even if a wrinkle measurement improvedBecause a controlled study showed reduced wrinkle depth, the muscle-relaxing mechanism is confirmed and the product works as described

Question 4

A prebiotic serum reports a significant change in bacterial composition at four weeks in a single-arm study of 18 participants, and the brand states that it restores a healthy microbiome. What is the strongest appraisal?Because the study found a statistically significant compositional change, the product alters the microbiome as claimed and skin health should followComposition, viability, activity and clinical outcome are four different measurements, and evidence for microbiome-targeted cosmetics remains preliminary, so a compositional change in a small single-arm study does not establish restoration or benefit

Question 5

A learner's dossier contains eight sources, a question and a decision, but no cost line, no stop rule and no referral note. A friend says it is a complete dossier because the evidence is extensive. What is the correct assessment?It is incomplete: a dossier without a comparison, a certainty label with criteria, an annual cost line, a tolerance stop rule and a written referral map cannot support a decision that can be reviewed rather than merely believedIt is complete because the number of sources is the measure of an evidence dossier, and a decision follows once the evidence has been gathered

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