Australians love a bit of spice in their lives—whether it’s a dash of cracked pepper on your eggs, a generous sprinkle of turmeric in your curry, or a garlicky marinade for the Sunday roast.
While herbs and spices are primarily valued for their culinary contributions, their potential interactions with human physiology are a subject of ongoing scientific inquiry.
Such considerations become particularly pertinent when individuals are managing pre-existing health conditions or pharmaceutical treatments.
But could your favourite seasonings be doing more than just tantalising your tastebuds? Recent research and expert advice suggest that, for some of us, the answer is yes—and it’s worth paying attention to what’s lurking in your spice rack, especially if you’re taking regular medication.
The surprising power of spices
We often think of herbs and spices as harmless kitchen staples, but many of them have potent biological effects. In fact, some of the same compounds that make spices so good for us—antioxidants, anti-inflammatories, and more—can also interact with medications in ways that are less than ideal.
Let’s take a closer look at some of the most common culprits and how they might be affecting your health.
Black pepper: The enzyme hijacker
That satisfying twist of the pepper mill does more than just add a kick to your meal. Black pepper contains piperine, a compound that can slow down the enzymes responsible for breaking down certain medications in your liver.
This means that drugs like propranolol (for blood pressure) or phenytoin (for seizures) can hang around in your system longer than intended, potentially leading to higher—and possibly dangerous—levels.
The good news? The average sprinkle is unlikely to cause problems. But if you’re a fan of high-dose pepper supplements or you’re in the habit of adding tablespoons (not teaspoons!) of pepper to your food, it’s time to take note.
Garlic: Friend or foe for blood pressure?
Garlic is famous for its heart-healthy benefits, including its ability to lower blood pressure. But if you’re already taking medication for hypertension, too much garlic can push your blood pressure down too far, leaving you feeling dizzy or faint.
Garlic also acts as a natural blood thinner, which can be risky if you’re on medications like warfarin or aspirin.
Ginger and turmeric: The bleeding edge
Ginger and turmeric have become the darlings of the wellness world, praised for their anti-inflammatory and immune-boosting properties.
But both can thin your blood and interfere with how your body absorbs certain drugs. For those on blood thinners or immune suppressants, these spices can amplify the effects of your medication, sometimes dangerously so.
Cinnamon, cloves, and licorice: The silent saboteurs
Not all cinnamon is created equal. Cassia cinnamon, the type most commonly found in supermarkets, contains coumarin, which can damage your liver in large amounts.
Cloves contain eugenol, another compound that can affect liver function and blood clotting. And licorice—often found in herbal teas and sweets—can raise your blood pressure and cause fluid retention, which is the last thing you want if you’re on antihypertensive medication.
Should you panic about your spice rack?
Absolutely not! For most people, the small amounts of spices used in everyday cooking are perfectly safe and can even be beneficial.
The real risk comes from overdoing it—think supplements, concentrated extracts, or consuming large quantities of raw spices.
If you’re on long-term medication, it’s a good idea to have a chat with your GP or pharmacist about your diet, including your use of herbs and spices.
They can help you identify any potential interactions and advise you on safe amounts.
A few practical tips:
- Stick to culinary amounts: A pinch here and a sprinkle there is unlikely to cause harm.
- Be wary of supplements: Spices in pill or extract form are much more concentrated than what you’d use in cooking.
- Read labels: Some herbal teas and health foods contain surprisingly high levels of certain spices.
- Monitor your health: If you notice new symptoms after changing your diet or starting a new supplement, talk to your doctor.
The bottom line
Spices are a wonderful way to add flavour and health benefits to your meals, but like all good things, moderation is key—especially if you’re managing a health condition or taking medication. With a little knowledge and care, you can keep enjoying your favourite dishes without worry.
Have you ever noticed a reaction to a particular spice, or has your doctor ever warned you about food and medication interactions? We’d love to hear your experiences and tips—share your thoughts in the comments below!
Disclaimer: The information in this article is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Everyone’s health is unique, so if you have any concerns or questions about your health, it’s always best to consult with a qualified healthcare professional. We encourage you to seek expert guidance before making any medical decisions.
Also read: The one health habit Australian men can’t afford to skip—don’t risk it
