ArticleslgStudy

science

Virol

Virol 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 Virol rather than just read about it. In short: Virol, also stylised as ViRoL, was a British twentieth-century brand of malt extract preparation that also included bone marrow, and was designed as a nutritional supplement for the feeding of infants. Ingredients The original ingredients of Virol were red marrow extracted by the use of glycerol from the rib bones of cattle and the bones of calves, refined beef fat, diastatic malt (containing a mixture of amylases t…

Virol — main illustration
Virol — illustration

Key takeaways

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

Reference excerpt

Virol, also stylised as ViRoL, was a British twentieth-century brand of malt extract preparation that also included bone marrow, and was designed as a nutritional supplement for the feeding of infants.

Ingredients The original ingredients of Virol were red marrow extracted by the use of glycerol from the rib bones of cattle and the bones of calves, refined beef fat, diastatic malt (containing a mixture of amylases that convert starch into maltose and dextrin), eggs, lemon syrup and soluble phosphates. This emulsified product was rich in nutrients and the manufacturing process did not destroy the vitamin content. Later, orange juice replaced lemon juice.

Ownership and production Virol was first made in 1899 as an experimental product by Bovril in their London factory in Old Street, and was designed as a nutritional supplement for the feeding of infants. A company was set up to manufacture it the following year. Demand grew, and by the 1920s, production was transferred to a larger, more modern factory in Perivale. Before World War II, the version "Virol and Milk" was established as a direct competitor to Horlicks. During the war, production ceased as the ingredients became too difficult or costly to acquire. After the war, production resumed and the brand changed hands several times with consolidation in the food processing industry, to Cavenham Foods in 1971, Janks Brothers in 1977, and Optrex in 1979. Virol was discontinued in the 1980s.

Promotion and purposes

In 1929, the product was exhibited at the British Industries Fair. Originally designed as a nutritional supplement for the feeding of infants, some children who grew up in the 1940s remember the weekly visit of the Virol Lady to their primary school, doling out spoonfuls of the sweet, sticky brown product to each child who had brought a penny to school for the purpose. Virol was initially supplied in ceramic jars of different sizes. By the 1950s it was marketed in brown glass jars as a health supplement. Alternative suggested usages were as a nerve tonic to treat depression and nervousness, for which purpose it was called "Virol and Milk", and as a laxative under the trade name "Virolax". The product was advertised on orange-navy-and-white, enamelled metal wall plaques as being of benefit to various groups; "Anaemic girls need it", "Growing boys need it", "School children need it", "Delicate children need it" and the more generic "For health and vitality". In an advertisement in Punch magazine in November 1950, an illustration of a boy giving a girl a piggyback was accompanied by the slogan "CHILDREN GROW STRONG ON VIROL. Virol is the food for growth. It provides these essential food factors – not vitamins alone, but also many others just as important – which are likely to be deficient in the rest of the diet. Give Virol after every meal. Children love the flavour of Virol and they thrive on it."

See also Extract of malt

References

Illustrations

Virol: Virol jar
Virol jar
Virol: Virol print advertisement from 1914
Virol print advertisement from 1914

Worked examples

Example 1 — a first encounter with Virol

Start with the simplest possible case. Write down what Virol 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 Virol 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 Virol 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 Virol

In research
Virol 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 Virol 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
Virol is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dietary supplements, Malt, so understanding it makes those chapters shorter.
In everyday life
Look for Virol 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.
Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Virol” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Virol in 20 minutes

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

Frequently asked questions

What is Virol in simple terms?

Virol, also stylised as ViRoL, was a British twentieth-century brand of malt extract preparation that also included bone marrow, and was designed as a nutritional supplement for the feeding of infants. Ingredients The original ingredients of Virol were red marrow extracted by the use of glycerol fr…

Why does Virol 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 Virol?

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 Virol.

Tags

  • Dietary supplements
  • Malt

Keep exploring