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activated charcoal crushed in a slate grey bowl

Activated charcoal: benefits, dosage, side-effects

23 Nov 2022 • 36 min read

Find out all about activated charcoal, including what it does, the benefits to taking it and how much you might need

Written by Rosalind Ryan on January 26, 2019 Reviewed by Carolina Brooks on January 31, 2019

What is activated charcoal and what does it do?

Activated charcoal is a fine, powdered form of the regular sort of charcoal that you’ve probably been putting on barbecues for years.1 But you’re more likely to find activated charcoal in drinks, skin-care products and even toothpaste. The charcoal is ‘activated’ by heating it to very high temperatures, which changes its internal structure. This creates a lot of small holes in each particle, increasing the surface area and making it more porous.2 One teaspoon of activated charcoal has roughly the same total surface area as a football field!3 The result is that activated charcoal is very absorbent, which means it can soak up or ‘trap’ a range of different substances.4 The charcoal then carries them out of the body, eliminating them from your system.5 Activated charcoal has been used in hospitals for years as an emergency treatment for overdoses,6 and this absorbent quality has led to its growing popularity as a product to support detoxification.

Benefits of activated charcoal

What does activated charcoal do in the body?

Activated charcoal is excellent at binding with toxins inside the body, so it’s often used in hospitals to treat different types of poisoning, including drug overdoses.7 This reduces how much poison the body absorbs, limiting the effects on the patient.8 However, it’s rarely used to treat alcohol poisoning, as alcohol is both rapidly absorbed by the gut and badly absorbed by activated charcoal.9 Researchers are currently studying activated charcoal for more potential health benefits, including:

1. Teeth whitening and skin care

You’ve probably seen plenty of YouTube clips with vloggers extolling the teeth whitening effects of charcoal toothpaste, but there’s currently no clinical evidence that is has this effect.10 However, there is a small amount of research on its potential purifying benefits for the skin. In 2017, Indian researchers reported that activated charcoal could help draw impurities such as dirt, dust, chemicals, toxins and bacteria to the surface of the skin, making it easier to wash them away.11

2. Lowering levels of ‘bad’ cholesterol

Several studies have found a link between activated charcoal and reduced LDL, or ‘bad’, cholesterol levels. According to one, published in The Lancet in 1989, people with high cholesterol who took 8g of charcoal three times a day for four weeks experience a 41% reduction in LDL cholesterol.12 Later research by the University of Helsinki, Finland, found that patients taking different doses of charcoal every day for three weeks had reduced LDL levels between 29% and 41%, while levels of ‘good’ HDL cholesterol increased by up to 121%.13

3. Relieving symptoms of bloating

Activated charcoal can help relieve gas/flatulence, a common symptom of bloating. A 1981 study discovered that the charcoal could reduce the number of ‘flatus events’ – yes, farting – after a gas-producing meal,14 while a trial in 2003 found that activated charcoal could reduce gas and abdominal bloating.15 Although not all studies have found a similar effect, the European Food Safety Authority says there is enough evidence to show that activated charcoal can reduce ‘excessive intestinal gas accumulation’.16 Activated charcoal has also been studied for its potential effects on:17
  • preventing hangovers
  • improving kidney function
  • reducing symptoms of fish odour syndrome, a metabolic syndrome that results in abnormal excretion of a particular chemical, for example in the breath, urine and sweat

Dosage

How much activated charcoal is safe to take?

There is no safe upper limit set for activated charcoal in the UK, but products often range from 25mg to 250mg.18 The EFSA recommends taking 1g at least 30 minutes before a meal, and 1g afterwards.19 Make sure you follow any instructions on the product packaging or label, and see your GP or a nutritionist if you have any concerns.

Side-effects

What are the side-effects of taking activated charcoal?

Although no serious side-effects have been reported after taking or using activated charcoal, you may experience nausea, black stools or constipation. Activated charcoal could also prevent you from absorbing any medications, so discuss this with your GP before you start taking it.

Sources


6. As Source 2 
8. As Source 4 
17. As Source 5 
19. As Source 16 
20. As Source 5
 

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