Can Antioxidants Slow Down or Reverse Aging?

Many people still believe that antioxidants slow down aging.

Antioxidants are substances like vitamin A, vitamin E, coenzyme Q10, beta-carotene, acetyl-cysteine, and so on. Antioxidants neutralize free radicals.

Free radicals are mainly a by-product of our metabolism. Free radicals are highly reactive particles that damage our DNA, proteins and cell membranes.

It has been thought for many decades that this accumulation of cellular damage by free radicals contributes to aging. And that antioxidants, which mop up these free radicals, extend lifespan.


Most antioxidants don’t extend lifespan

In the past two decades, many large studies found that antioxidants do not slow down aging and don’t reduce mortality (R,R,R).

One large meta-analysis consisting of 230,000 people even found that some antioxidants are associated with an increased risk of dying (R): vitamin A, vitamin E and beta-carotene intake was associated with slightly increased mortality.

Of course, many arguments can be brought up to counter these findings: in many studies the wrong form of antioxidants are given, or too low doses, or too late.

Still, both animal and human studies have painted a disappointing picture about the role of antioxidants in longevity. Animals have been given all kinds of antioxidant cocktails, but they didn’t live longer. At least according to well-conducted studies; there are many low-quality studies that sometimes do show that antioxidants slow down aging. But often, when these studies are reproduced by other research groups no longevity effects are seen.

The dangers of antioxidants

Many studies have shown that antioxidants can even be dangerous, for example by increasing the risk of cancer or helping cancer to spread (metastasize) (R,R,R,R,R).

Since cancer cells have high metabolic activity, they generate significant amounts of free radicals as a byproduct of their metabolism. As a result, cancer cells may benefit from antioxidants that neutralize these free radicals. However, it is not always recommended for cancer patients to take antioxidants, as the use of antioxidants during cancer treatment may have unintended effects on treatment outcomes.

Other studies show that antioxidants can undo the beneficial effects of exercise (R). Taking antioxidants to “recuperate” faster from exercise is also not always a good idea.

Why antioxidants don’t really work to extend lifespan

Research shows that most antioxidants do not extend lifespan.

And if some antioxidants do extend lifespan, it’s often not because of their antioxidant activity, but because of other mechanisms, such as their anti-inflammatory, epigenetic or mitochondrial activity.

But why is it that most antioxidants don’t work?

One problem is that antioxidants, when taken orally, cannot enter the regions in the cells where they are most needed, and this in high enough concentrations.

But even then, studies in which animals are genetically modified to produce much more antioxidant enzymes (like catalase), do not live longer.

Such antioxidant enzymes work much better than antioxidants (small-molecules) taken by mouth, but still they do not seem to have significant effects on lifespan.

Even more confusingly, mounting evidence shows that the substances antioxidants are supposed to neutralize, free radicals, can even have life extension effects.

For example, genetically modified worms that produce more free radicals live 32% longer. Giving worms a weed-controlling herbicide that creates a surge in free radical production extends lifespan in these worms by 58% (R). 

How is this possible? Free radicals can function as a benign warning sign, revving up the cell’s defense mechanisms, like detoxification enzymes and repair proteins, protecting our cells against age-related damage.

That’s one reason why exercise is healthy: during exercise you produce a lot of free radicals because your cells have to work much harder. These exercise-induced free radicals activate all kinds of repair and defense mechanisms in our cells, so that the cells can better protect themselves against the next time you exercise. In the meantime, these revved-up defense and repair mechanisms also protect you against aging and aging-related diseases.

Besides exercise, we know that foods like vegetables, fruits and green tea are healthy. The classic, main explanation for this is that these foods contain antioxidants. But this is an oversimplification. A reason that healthy food is healthy is not because of its antioxidant activity, but because this food contains slightly toxic substances. These substances upregulate detoxification and repair enzymes in the body, so that our body is better protected against damage.

Healthy food is healthy not so much because of its antioxidants

Healthy foods are also healthy due to reasons other than their oxidants. Healthy food contains substances that have epigenetic effects, that reduce inflammation, that are beneficial to the gut microbiome, that do not overstimulate aging pathways (like mTOR or insulin receptors), that improve mitochondrial functioning. And of course, healthy foods deliver vitamins and minerals our body needs to function properly.

So healthy food is much more than just antioxidants.

Antioxidants and aging

The whole notion that antioxidants can slow down aging is a huge oversimplification of the aging process.

We know that we age because of many other mechanisms than accumulation of oxidative damage.

We also age because of epigenetic dysregulation, protein accumulation, lysosomal dysfunction, telomere shortening, cross-linking, mitochondrial dysfunction (in which most mitochondrial damage is not caused by oxidative damage, but by mutations in the mitochondrial DNA as a consequence of mitochondrial division), and so on. Aging is much more complex than just free radicals damaging our cellular machinery.


In conclusion, taking antioxidants is not a good way to extend your lifespan. Of course, when you are deficient in specific antioxidants, such as vitamin A, vitamin E or other vitamins, taking these antioxidants can be useful. But taking large doses of extra antioxidants to slow down the aging process doesn’t seem to work unfortunately.

To slow down aging and to extend human lifespan, we need to look beyond antioxidants. We need to take in substances that act on various other aging mechanisms, like epigenetic dysregulation, protein accumulation and mitochondrial dysfunction.



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