Scientists have sounded the alarm over a common kitchen spice, warning that it could interfere with the effectiveness of prescription drugs. While a dash here and there is likely harmless, 'excessive amounts', particularly in supplement form, could pose risks.

The spice in question? Cinnamon. Experts at the University of Mississippi point to 'cinnamaldehyde', a cinnamon component that may trigger receptors affecting how the body processes medication.

This could mean that high consumption of cinnamon might weaken the impact of certain drugs, though further studies are necessary to establish this link.

"Health concerns could arise if excessive amounts of supplements are consumed without the knowledge of health care provider or prescriber of the medications," said Shabana Khan, a principal scientist at the National Centre for Natural Products Research.

"Overconsumption of supplements could lead to a rapid clearance of the prescription medicine from the body, and that could result in making the medicine less effective."

Beyond its culinary uses, cinnamon is often celebrated for its supposed health benefits. Regular intake has been associated with lowering blood pressure and potentially reducing the risk of cardiovascular diseases. These heart-related conditions claim around 17.9 million lives each year, according to the World Health Organisation.

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However, it's essential to recognise that not all cinnamon is the same. While cinnamon oil, often used to flavour food and drinks, poses 'almost no risk of herb-drug interactions', there's a different story regarding cinnamon bark.

The type raising concern among researchers in the US is Cassia cinnamon, the kind you're likely to pick up at your local supermarket. It's packed with 'coumarin', known for its 'anticoagulant properties', suggesting that cinnamon could potentially act as a blood thinner.

In light of this, scientists advise individuals to speak with their GP before mixing cinnamon supplements with prescription medications. Although more clinical trials are needed to confirm their thoughts, the combination of blood thinning and drug metabolism effects from certain cinnamon products could be hazardous for those with existing health conditions.

"People who suffer from chronic diseases – like hypertension, diabetes, cancer, arthritis, asthma, obesity, HIV, AIDS or depression – should be cautious when using cinnamon or any other supplements," Khan added.

"Our best advice is to talk to a health care provider before using any supplements along with the prescription medicine. By definition, supplements are not meant to treat, cure or mitigate any disease."