Complete Guide to Antioxidants: What They Are and Where to Find Them

Antioxidants sound like the sort of thing we should all deeply understand by now, right up there with pensions and how to bleed a radiator. Yet most explanations make you feel like you’ve accidentally wandered into a chemistry exam.

Let’s fix that.

In plain English, antioxidants are compounds found in plenty of foods, especially colourful fruit and veg, that help protect your cells from oxidative stress.

That is the quick answer. They support the everyday work your body already does to protect and repair itself. But if you want to know how they actually work, and how to get more of them into your morning routine without chewing on raw kale like a stressed rabbit, let’s take a look.

What are free radicals and oxidative stress?

To understand antioxidants, you first need to meet the troublemakers: free radicals.

Free radicals are unstable molecules looking for a spare electron. Your body produces them naturally during everyday processes like breaking down food and exercising, but things like air pollution, cigarette smoke, alcohol, and too much UV exposure also add to the load.

Because free radicals are missing an electron, they try to take one from nearby molecules. When too many build up, it creates a state called oxidative stress. Harvard Health notes that this can damage cell membranes, proteins, and DNA over time.

This is where antioxidants step in. They neutralise free radicals by donating an electron of their own, helping stop the chain reaction before it causes more damage.

It is a delicate balancing act. A few free radicals are normal. Too many, with too little antioxidant support, is where things start to get messy.

Expert insight from our nutritionist:

“Think of free radicals a little like rust on a bike. Some wear and tear is normal, but you still want protection. Antioxidants from a varied diet help support the body’s natural defence network, which is one reason colourful fruit and veg are such useful everyday foods.”

The Main Types of Antioxidants in Fruit & Veg

When you look at the back of a smoothie pack, you are not just looking at a shopping list of ingredients. You are looking at a mix of vitamins, plant compounds, colours and nutrients, all doing slightly different jobs.

A bit like a proper security team, different antioxidants have different specialities. Here are the heavy hitters worth knowing.

Vitamin C

Probably the most famous antioxidant around, and for good reason. Vitamin C is water-soluble, which means your body uses it in watery environments like blood and other body fluids. It also contributes to normal immune function, supports normal collagen formation, and helps protect cells from oxidative stress.

• Where to find it: citrus fruits, tropical favourites like mango and pineapple, and juicy strawberries.

Anthocyanins

These are the pigments that give deep red, purple and blue fruits their spectacular colour. Beyond making berries look deeply snackable, anthocyanins are part of the polyphenol family. They have been widely studied for their links with heart health, blood vessel function, and the benefits of eating more colourful plant foods.

• Where to find them: blueberries, blackberries, raspberries and strawberries.

Betalains

If you have ever chopped beetroot and ended up with hands that look like a crime scene, you have betalains to thank. These nitrogen-containing pigments are relatively rare in the plant world, but they are being studied for their antioxidant and anti-inflammatory properties.

• Where to find them: beetroot, mostly.

Carotenoids

These are the fat-soluble compounds responsible for many bright orange, yellow and green plant foods. Beta-carotene is one of the best-known examples. Your body can convert it into vitamin A, which helps maintain normal vision, skin and immune function while supporting cell membrane health.

• Where to find them: carrots, mangoes, spinach and kale.

The Best Fruit and Veg for Antioxidants

Now we know what these compounds do, let’s look at where to find them in real life.

Scientists often use a laboratory test called FRAP, which stands for Ferric Reducing Ability of Plasma, to measure antioxidant activity. Essentially, it tests how well a food sample performs in a lab setting.

The important bit: a higher FRAP score means higher antioxidant activity in that test. It does not perfectly replicate what happens inside your body after digestion, because bodies are a little more complicated than test tubes. Annoying, but true.

Still, FRAP scores give us a useful way to spot some of nature’s most antioxidant-rich foods. Here are five fruit and veg worth getting into your routine.

1. Blueberries: the berry with the big reputation

• The FRAP score: up to 9.2 mmol per 100g.

• The science: Blueberries are low in calories but rich in anthocyanins, the plant pigments behind their deep blue-purple colour. A 2019 study in The American Journal of Clinical Nutrition found that eating the equivalent of around one cup of blueberries a day improved some markers of vascular function in people with metabolic syndrome. Blueberries are also often studied for their possible links with brain health as we age.

• The Love Struck route: Try Blueberry Thrill or Oat Of This World for a hassle-free way to add blueberries to your morning.

2. Strawberries: the vitamin C all-star

• The FRAP score: up to 5.4 mmol per 100g.

• The science: Strawberries bring a useful mix of vitamin C, fibre and anthocyanins. That makes them a brilliant everyday fruit, especially if you want something sweet, colourful and genuinely useful. Strawberries have also been studied for their links with inflammation markers and cholesterol levels, especially as part of wider healthy eating patterns.

• The Love Struck route: Try Strawberry Split, packed with juicy Camarosa strawberries, or grab a Big 5 for an extra hit of pineapple and mango.

3. Raspberries: fibre-rich and full of colour

• The FRAP score: up to 4.0 mmol per 100g.

• The science: Tangy, bright and brilliant, raspberries bring together antioxidant compounds, ellagitannins and dietary fibre. That fibre part matters. The British Nutrition Foundation notes that adults in the UK are recommended to eat 30g of fibre a day, but currently average around 20g. Raspberries bring a useful mix of fibre and plant compounds, which makes them a smart everyday choice for gut-friendly variety.

• The Love Struck route: Berry-Go-Round is loaded with raspberries, strawberries and blackberries for a triple-berry blend without the fridge roulette.

4. Kale: the leafy green heavyweight

• The FRAP score: up to 2.7 mmol per 100g, rising to around 4.1 mmol for red varieties.

• The science: Kale earns its reputation because it brings vitamin C, vitamin K, beta-carotene, fibre and a decent mix of minerals. Red varieties also contain more anthocyanins, which is one reason their antioxidant activity can test higher than standard green kale.

• The Love Struck route: Skip the endless chewing and blend a Kale Kick with mango and spinach for an easy green win.

5. Beetroot: earthy, colourful and nitrate-rich

• The FRAP score: up to 1.7 mmol per 100g.

• The science: Beetroot gets its deep colour from betalains, antioxidant pigments that are less common in everyday fruit and veg. It is also a source of dietary nitrates, which the body converts into nitric oxide. The British Heart Foundation notes that nitrates found naturally in beetroot can help keep blood pressure in check.

• The Love Struck route: If you are not a fan of that intense, earthy salad taste, Dr Beet blends beetroot with sweet mango and carrot, giving you the good stuff in a genuinely delicious drink.

Fresh vs Frozen: The Antioxidant Reality

There is a common myth that fresh fruit and veg sitting in a rustic basket on the kitchen counter are inherently better for you than anything found in the freezer.

The science tells a different story. Research comparing fresh and frozen produce has found that frozen fruit and vegetables can retain similar levels of key vitamins to fresh produce, and in some cases contain more after storage.

From the moment fruit or vegetables are harvested, their nutrients and antioxidant levels slowly begin to degrade. "Fresh" produce bought from mainstream supermarkets has often been picked before it is fully ripe, stored in dark warehouses, and transported over huge distances before it finally reaches the shelves.

Our frozen smoothie packs rely on flash-freezing instead. The ingredients are picked at peak ripeness when their nutrient density is highest, and flash-frozen within two hours of harvest. This process effectively locks the antioxidants and vitamins in place, stopping the countdown clock.

For a busy household, this also eliminates the dreaded "fridge roulette" where expensive berries turn to mush before you get a chance to use them.

Should You Take Antioxidant Supplements?

Walk down the health food aisle and you will find bottles of high-dose antioxidant capsules with names that sound like sci-fi characters.

Most nutrition guidance points in the same direction: for everyday health, it is usually better to get antioxidants from a varied diet than from high-dose supplements, which can provide too much of a single compound and disrupt the delicate balance that your cells rely on.

For most people, the best way to start is a varied, colourful diet. Real food brings a complex matrix of vitamins, minerals, and fibres that work together synergistically.

Easy Ways to Add More Antioxidants to Your Diet

Building a strong internal defence network doesn't require a radical lifestyle overhaul. You can make a real difference by making a few simple adjustments to your daily routine:

• Brighten up breakfast: Toss a handful of deep red or blue berries over your morning oats or yoghurt.

• Eat the rainbow: Aim for visual variety on your dinner plate by mixing greens, oranges, and deep purples.

• Use your freezer: Keep frozen fruit and vegetable portions ready to go so you always have plant variety on hand.

• Blend your plants: Smoothies are a brilliant shortcut for mixing ingredients you might not otherwise eat in large quantities, like raw leafy greens or earthy root vegetables.

Quick Love Struck Blends Directory

If you want a direct route to these nutrient-dense ingredients without the prep, here is exactly where they live on our menu: