Pick up any bottle of vape juice and you will find a small block of text covering ingredients, nicotine strength, warnings and more. Most people glance at the flavour name and move on. Yet that small print is the most direct source of information you have about what you are about to use, and knowing how to read e-liquid ingredient declarations helps you check strength, spot unfamiliar terms and compare products with confidence.
This guide is written for adult consumers in the United Kingdom, including current vapers and smokers who are comparing nicotine products. It explains what an e-liquid ingredient declaration is, how to interpret common ingredient names, how to read nicotine strength, which warnings to look for, and what a label cannot tell you. Vaping is not risk-free and nicotine is addictive, so it is intended only for adults who already use nicotine. Nothing here is medical advice.
What Is An E-liquid Ingredient Declaration?
An e-liquid ingredient declaration is the part of a product’s labelling or product information that names the substances the manufacturer states are in the liquid. In other words, it is the e-liquid ingredient list: a statement of composition, not a quality guarantee.
Ingredient List Versus Other Label Information
It helps to separate the ingredient list from the other details that sit around it. An ingredient list identifies what is stated to be in the liquid. Other parts of the packaging describe different things:
- Nicotine information: the stated concentration, usually in mg/ml.
- Volume: how much liquid the bottle holds, usually in ml.
- Warnings and hazard information: the required nicotine health warning and any other safety text.
- Traceability and contact details: batch information and details of the producer, importer or supplier.
- Instructions: storage, handling and use guidance.
Not every detail appears in the same place on every product. Some appear on the bottle, some on the outer carton and some in an insert, so check all the packaging before concluding that something is missing.
Who Decides What Has to Appear?
The required content depends on the product category. In the UK, nicotine-containing e-liquids sold in refill containers fall under the Tobacco and Related Products Regulations 2016 (often shortened to TRPR), which set labelling and packaging rules. Products that are authorised as medicines are covered by a different regime. Non-nicotine liquids are treated differently again. Because the rules vary, never assume that two bottles from different sources must show the same information in the same format.
Which Ingredients Commonly Appear In Vape Juice?
Most e-liquid compositions are built from a small group of ingredient types: a liquid base (propylene glycol and vegetable glycerine), flavourings and, in nicotine products, nicotine. Beyond that, formulations differ, and no single list describes every product.
What Does Pg Mean On A Vape Liquid Label?
PG stands for propylene glycol, a clear, thin, nearly odourless liquid. It is widely used as a carrier in e-liquids because it mixes readily with flavourings and nicotine. On a label you may see it written as propylene glycol, PG or sometimes a chemical synonym. If you are unsure, a quick search of the exact name will confirm what an unfamiliar term refers to.
Two cautions apply. First, the presence of PG on a list tells you the substance is stated to be in the product; it does not, by itself, establish that the finished product is safe. Second, individual responses to ingredients vary, and a label cannot tell you how a particular person will react. If you have concerns, a pharmacist or GP is the right person to ask.
What Does Vg Mean in E-liquid?
VG stands for vegetable glycerine (also spelled glycerol). It is a thicker, slightly sweet liquid that manufacturers commonly use in e-liquid formulations. Because it is more viscous than PG, the proportion of VG in a mixture influences how thick the liquid is, which in turn can affect how it behaves in different devices.
A stated VG percentage is not the same as a full ingredient declaration. A line such as “30% VG” describes one component’s share of the base. It does not tell you what else is in the bottle.
Are Flavourings Listed On E-liquid Packaging?
Sometimes, but the level of detail varies. Flavourings can appear as a general term, or the declaration may be more specific, depending on the product and the information the producer chooses or is required to provide. The key point is that a flavour name on the front of the bottle, such as “cherry” or “menthol”, is a marketing description. It is not a complete description of every flavouring substance used.
For that reason, a named flavour should never be read as revealing the full chemical composition. It is also unwise to treat a flavouring as harmless simply because something similar is used in food. Substances that are suitable for eating are assessed for swallowing, and that is a different matter from being heated and inhaled.
What About Other Ingredients?
Some products may include additional ingredients, and the declaration is where you would expect to find them named. Equally, the absence of a substance from a declaration should not automatically be taken as proof that a product is “free from” it. Unless the product information clearly states a conclusion such as “free from” a named substance, treat silence as silence, not as a guarantee.
The law also limits what can be used. Government guidance explains that certain additives, including colourings, caffeine and taurine, are banned in nicotine e-liquids, and that apart from nicotine, ingredients must not pose a risk to human health. A label cannot show you that these rules have been met, which is one reason the checks in the sections below matter.
How Do You Read a Pg And Vg Ratio?
A PG and VG ratio shows the relative proportions of the two base liquids, for example 70/30 (70% PG, 30% VG) or 50/50. The first figure is conventionally PG. Three points help you interpret it correctly:
- A ratio is a partial description. It covers the base liquids, not the flavourings or nicotine.
- Not every product states one. Some show an exact ratio, some a range and some none at all.
- Basis can differ. Ingredient lists in the UK are described in order of weight, while a ratio is often quoted by volume, so do not assume the two always line up neatly.
As a real example of published information, the Cloud 9 Liquids website describes its Menthol and other core e-liquids as a 70% PG to 30% VG mixture. That is the stated ratio on the product pages. It is not an indication that every product from every producer, or even every product on a single site, uses the same formulation.
How Do You Read Nicotine Strength On A Vape Bottle?
Nicotine strength on an e-liquid label is a concentration, normally written in mg/ml. It tells you how many milligrams of nicotine are in each millilitre of liquid, not the total amount in the bottle.
What Does Mg/ml Mean on An E-liquid Label?
The unit mg/ml means milligrams of nicotine per millilitre of liquid. A bottle labelled 12 mg/ml contains 12 mg of nicotine in every ml. Some products show the same figure as a percentage: 1% equals 10 mg/ml, so 2% equals 20 mg/ml.
Strength, Concentration and Volume Are Different Things
These three terms are often mixed up:
- Nicotine strength is the everyday name for the stated concentration.
- Nicotine concentration is the technical term for the same thing: mg of nicotine per ml.
- Volume is the quantity of liquid in the container, in ml.
To estimate the total nicotine in a bottle, multiply concentration by volume. As a purely illustrative example, a 10 ml bottle at 12 mg/ml holds roughly 120 mg of nicotine (12 × 10). A 10 ml bottle at 6 mg/ml holds about 60 mg. These sums show how to read figures; they do not describe any specific product.
The Cloud 9 Liquids website describes its regular-strength e-liquid as 18 mg/ml, and its menthol product page lists bottles of 10 ml. Applying the method above, you can work out the total nicotine figure for yourself. The same principle applies to any bottle you read.
Why the Number Matters
Nicotine is addictive. Check the stated strength and units before using any bottle, make sure you are comfortable with the figure, and never rely on memory from a previous purchase, because the same flavour can be sold in more than one strength. In the UK, government guidance says nicotine e-liquids are limited to 20 mg/ml and refill containers to 10 ml, so a nicotine product above either figure is a reason to stop and check the seller.
Which Warnings And UK Labelling Details Should You Check?
For nicotine-containing e-liquids, UK trading standards guidance summarises the labelling rules under the TRPR as including an ingredient list in descending order by weight, nicotine content and delivery per dose, and a specific health warning that the product contains nicotine, which is a highly addictive substance. The same guidance notes that alternative wording is not acceptable. If a label uses a different nicotine warning from the one required, that is worth raising with the seller or your local trading standards service.
What Else Might Appear On The Pack?
Depending on the product, you may also see other items that are part of the wider framework:
- Hazard information: signal words or pictograms that vary with nicotine concentration under chemical classification and labelling rules.
- Batch or traceability information: helps identify a production run if a query arises.
- Producer, importer or supplier details: so you know who is responsible for the product.
- Child-resistant, tamper-evident packaging: required for nicotine refill containers under the TRPR.
- An information leaflet or insert: may carry usage, storage and contact details.
The exact details required are set out in the regulations and official guidance, and they can change. The Medicines and Healthcare products Regulatory Agency (MHRA) publishes guidance for e-cigarette and refill products on GOV.UK, and it also runs the notification scheme under which nicotine vaping products are submitted before they are placed on the market. For the current position, check GOV.UK rather than relying on a summary, including this one.
Rules are Changing
UK vaping law is in motion. The Tobacco and Vapes Act received Royal Assent on 29 April 2026, and the government has since consulted on measures such as plain packaging and tighter rules on flavour descriptions. Details of when and how any of this affects labels and product names may change. Check official sources for current requirements, and do not assume that today’s packaging will look the same in future.
A Step-by-step Routine For Checking An E-liquid Label
Here is a practical routine for anyone wondering how to read vape juice labels, working from the top of the bottle down. It also works as a way to compare e-liquid ingredient declarations between products.
- Read the product name and description. Confirm it is the product you intended to buy, including the flavour and the strength variant.
- Find the ingredient list. Look for named ingredients and the order they appear in. Note whether flavourings are described generally or in more detail.
- Look for PG and VG information. If a ratio is given, note it. If none is given, do not assume one.
- Check nicotine strength and units. Make sure it says mg/ml (or a percentage) and that the figure matches what you wanted.
- Check the bottle volume. Multiply strength by volume if you want to know the total nicotine in the container.
- Find the health warning. Check that the required nicotine warning is present and clearly legible.
- Look for batch and supplier details. Note who is named as the producer, importer or supplier, and whether a batch reference is printed.
- Read storage and handling instructions. Keep the product out of reach of children and follow any guidance on use.
- Check any regulatory information. If something looks missing, look at the outer carton, an insert or the product page before drawing conclusions.
Comparing Labels Responsibly
When you compare two products, compare like with like. Use the same strength, a similar volume and the same level of detail on the label. A product that lists more detail is easier to evaluate, but more words on a label do not make a product better, and fewer words do not make it worse. If a label leaves out something you want to know, ask the seller. Cloud 9 Liquids invites customers to use its contact page for product questions, and its FAQ page covers common queries.
What Can An Ingredient Label Not Tell You?
Reading a label is not the same as independently verifying a product’s chemical composition. A label is a set of statements made by the producer or supplier. It does not show the results of laboratory analysis, it does not reveal ingredient concentrations unless they are stated, and it cannot confirm that the contents match the description.
For that reason, a label alone does not prove that an e-liquid is high quality, pure, authentic or safe. Does an ingredient label prove that an e-liquid is safe? No. It is a transparency tool, and a useful one, but it is only one piece of the picture alongside legal compliance, responsible sourcing and your own judgement.
Two habits help. First, buy from sellers who are clearly identified and who give you ways to ask questions. Second, treat marketing language with care. Phrases such as “premium” or “pharmaceutical grade” are descriptions the seller chooses to use, and they are not substitutes for reading the declaration itself. The Cloud 9 Liquids website uses descriptions of this kind, along with product statements such as no animal extracts and diacetyl free, which readers should treat as the brand’s own published statements and weigh up alongside the label on the bottle in front of them.
Summary: Reading E-liquid Labels With Confidence
Knowing how to read e-liquid ingredient declarations comes down to a handful of habits. Understand that the e-liquid ingredient list names stated ingredients, while strength, volume, warnings and supplier details sit alongside it. Recognise PG and VG for what they are and remember that a ratio does not describe the whole formulation. Read nicotine strength in mg/ml, multiply by volume to find the total, and never forget that nicotine is addictive. Look for the required warning and the other details that the UK rules call for, and bear in mind that the rules are evolving. Finally, accept that a label is a starting point for questions, not proof of safety.
If you are an adult nicotine user comparing options, take a few minutes to review the published product information for the Cloud 9 e-liquid range, including individual product pages such as menthol and cherry, then check the details against the packaging when it arrives. You can learn more about the business on the About page or by visiting Cloud 9 Liquids directly. This content is for adults aged 18 and over. Vaping is not risk-free and nicotine is addictive.