science

Mederma

Mederma is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Mederma rather than just read about it. In short: Mederma is a topical product used to improve scar appearance. It is a gel based on an onion extract.

Key takeaways

Mederma belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mederma to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mederma from memory before moving on to harder problems.

Reference excerpt

Mederma is a topical product used to improve scar appearance. It is a gel based on an onion extract. Mederma is product of HRA Pharma, a division of Perrigo. A Mederma marketing claim is that the product can make scars "softer, smoother, and less noticeable".

Ownership The Mederma brand was owned by Merz Pharma for over 20 years until its 2019 sale to HRA Pharma. Perrigo then acquired HRA Pharma as a subsidiary in 2021.

Effectiveness A 1999 pilot trial found an onion extract gel less effective than the petrolatum. A 2002 study published in Plastic and Reconstructive Surgery examined the effectiveness of Mederma on hypertrophic scars on rabbit ears. It found no significant reduction in the size, height, or inflammation of scars. The only improvement was dermal collagen organization when compared to scars that were not treated with Mederma, thus suggesting that it may have a positive effect on the formation of raised scars. A 2006 clinical trial found no statistically significant change in hypertrophic scar appearance from products of this type compared to the standard petrolatum emollient. According to a 2011 Los Angeles Times article, "there were just two randomized comparison trials of Mederma, with a combined total of 38 participants. Neither trial found that Mederma improved the appearance of scars more than petroleum jelly".

Ingredients

Active Allantoin

Inactive Water (purified), PEG 200, alcohol, xanthan gum, allium cepa (onion) bulb extract, lecithin, methylparaben, sorbic acid, panthenol, sodium hyaluronate, fragrance

References

Worked examples

Example 1 — a first encounter with Mederma

Start with the simplest possible case. Write down what Mederma claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Mederma before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Mederma ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Mederma

In research: Mederma appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Mederma in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Mederma is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dermatologic drugs, Ointments, so understanding it makes those chapters shorter.
In everyday life: Look for Mederma outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Mederma in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mederma means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Mederma out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mederma in simple terms?

Mederma is a topical product used to improve scar appearance. It is a gel based on an onion extract.

Why does Mederma matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Mederma?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Mederma.