Short answer
It depends on the product. Green coffee beans naturally contain caffeine, and extracts range from almost caffeine-free to as much as a cup of coffee per dose. Always look for caffeine per capsule on the label. For comparison, the NHS says a cup of instant coffee has about 100mg. CGA Slender, for example, contains 8mg per capsule.
Updated October 2026.
Green coffee bean extract is popular in weight-management supplements, mainly for its chlorogenic acid. Because it comes from coffee, many people reasonably ask: how much caffeine am I actually taking? The honest answer is that it varies hugely between brands, and some labels make it hard to tell. This guide shows you how to work it out.
Why green coffee extract contains caffeine
Green coffee beans are simply raw coffee beans that have not been roasted. They contain caffeine naturally, just like roasted beans. Roasting does not remove much caffeine, but it does break down much of the chlorogenic acid, which is why supplements use unroasted beans.
How much caffeine ends up in the capsule depends on how the extract is made. Some manufacturers remove most of the caffeine, some leave it in, and some even add extra caffeine for a stimulant effect. Two products that both say green coffee can be completely different.
Caffeine compared: supplements, tea and coffee
| Source | Caffeine |
|---|---|
| Cup of instant coffee | about 100mg |
| 250ml can of energy drink | about 80mg |
| Cup of tea | about 75mg |
| Can of cola | about 40mg |
| 50g bar of plain dark chocolate | under 25mg |
| CGA Slender, 3 capsules (maximum daily use) | 24mg |
| CGA Slender, 1 capsule | 8mg |
Drink figures from the NHS. Filter coffee and coffee-shop drinks can contain more.
How much caffeine is safe? UK guidance
- Healthy adults: up to 400mg a day is considered safe, and single doses up to 200mg do not raise concerns, according to the European Food Safety Authority, whose opinion the UK Food Standards Agency supports (EUFIC summary of the EFSA opinion).
- Pregnancy: the NHS advises no more than 200mg a day. Remember to count caffeine from supplements as well as drinks.
- Children: caffeine-containing supplements are not recommended.
The key is your total for the day. A supplement with 8mg is small, but one with 100mg or more per dose can quickly push a coffee drinker over the limit.
How to read the label
- Look for caffeine per capsule or per serving. In the UK, supplements with added caffeine must state it, and responsible brands state natural caffeine too.
- Check the daily dose. Multiply the caffeine per capsule by the number of capsules you will take.
- Watch for added stimulants. Some fat-burner blends add caffeine anhydrous, guarana or green tea extract on top of green coffee.
- Check the chlorogenic acid percentage. Good extracts are standardised, for example to 50% chlorogenic acid, so you know what you are getting.
Green coffee extract and Ramadan
Supplements can only be taken at Suhoor or Iftar, because swallowing a capsule breaks the fast. With caffeine, timing matters: a dose late at night can make it harder to sleep before an early Suhoor. If you take a caffeine-containing supplement, take it with Iftar rather than late in the evening, and count the tea and coffee you drink after sunset too.
Who should be careful
- Anyone who is pregnant or breastfeeding
- People sensitive to caffeine, for example if it causes anxiety, a racing heart or poor sleep
- Anyone with a heart condition, high blood pressure or on regular medication
- With CGA Slender specifically: it also contains iodine at 133% NRV per capsule from kelp, so anyone with a thyroid condition or taking thyroid medication should speak to their GP first
Is green coffee extract halal?
Coffee and caffeine are halal. As with any supplement, the question is the rest of the product: the capsule shell (gelatine or plant-based HPMC), flavourings and processing aids. Look for independent halal approval of the whole product.
A low-caffeine green coffee option
CGA Slender provides 8000mg equivalent of raw green coffee bean, standardised to 50% chlorogenic acid, with just 8mg of caffeine per capsule. It also contains Ceylon cinnamon, kelp and cayenne. Green coffee itself has no authorised health claim, so the formula's claims come from its minerals: chromium contributes to the maintenance of normal blood glucose levels and normal macronutrient metabolism, and iodine contributes to normal energy-yielding metabolism and normal thyroid function. It comes in vegan HPMC capsules and is halal and kosher approved. For more on the research, see our green coffee extract evidence guide.
Try CGA Slender with 10% off your first order
Use code HALAL10 at checkout (one use per customer). 8mg caffeine per capsule, halal and kosher approved, vegan. Shop CGA Slender
Questions people ask
Does green coffee extract have as much caffeine as coffee?
Usually not, but it depends on the brand. Some extracts are close to caffeine-free, while others contain as much as a cup of coffee per dose. Check the caffeine per capsule on the label.
Can I take green coffee extract while pregnant?
Speak to your midwife or GP first. The NHS advises no more than 200mg of caffeine a day in pregnancy, and many green coffee supplements are labelled as not recommended for pregnant women.
Will green coffee extract keep me awake?
A low-caffeine product such as CGA Slender (8mg per capsule) is unlikely to affect most people, but sensitive people should avoid taking caffeine late in the evening.
Is green coffee bean extract decaffeinated?
Some are, many are not. The label should tell you: look for caffeine per serving or the word decaffeinated.
Is green coffee extract halal?
Coffee and caffeine are halal. Check that the capsule and other ingredients are halal too, ideally through independent halal approval. CGA Slender is halal and kosher approved.
This article is general information, not medical advice. Food supplements should not replace a varied diet and healthy lifestyle. Speak to your GP before taking supplements if you are pregnant or breastfeeding, have a medical condition or take prescription medicine.
