What Is Malic Acid? Uses, Food Sources, Citric Acid Differences & L- vs DL-Malic Acid Explained

Take a bite of an apple and you will notice a refreshing tartness beneath its sweetness. One of the compounds responsible for that familiar tang is malic acid.

Its name may make it sound like something found only in apples, but malic acid also occurs naturally in grapes, pears, ume, berries, tomatoes and many other plants.

What makes malic acid even more interesting is that it is not limited to foods.

It is also present in our bodies and appears in the processes our cells use to produce energy.

You may also come across malic acid in food as an acidulant or pH adjuster, and in the ingredient lists of cosmetics and hair care products.

Once you start looking into malic acid, however, plenty of questions appear:

“What is malic acid actually good for?”
“Does it really help with fatigue?”
“How is it different from citric acid?”
“What are L-malic acid and DL-malic acid?”
“How is it used as a food additive?”
“Why is it found in skincare and hair care products?”
“Can malic acid really whiten teeth?”

In this article, we will explore the basics of malic acid, its role in the body, food sources, how it differs from citric acid, its use in food additives, cosmetics and hair care, and what to know about safety.

What Is Malic Acid? The Basics

Malic acid is a type of organic acid known chemically as malic acid.

Its molecular formula is C4H6O5. It contains one hydroxyl group and two carboxyl groups, is soluble in water and has a characteristically refreshing sour taste.

Its Name Really Does Come from Apples

Malic acid has a long history. It was isolated from unripe apples in 1785 by Swedish chemist Carl Wilhelm Scheele.

The word “malic” comes from the Latin word malum, meaning apple.

So the name “malic acid” directly reflects the fruit from which it was first isolated.

What Is an Organic Acid?

“Organic acid” may sound like a highly technical term, but these compounds are very familiar in everyday foods.

Examples include:

• Malic acid
• Citric acid
• Lactic acid
• Acetic acid
• Tartaric acid

Organic acids help create many of the flavours we recognise in food, from the refreshing tartness of fruit to the acidity of vinegar and the distinctive character of fermented foods.

Malic Acid Is Found in More Than Just Apples

Despite its name, malic acid occurs naturally in a wide range of foods.

Common examples include:

• Apples
• Pears
• Grapes
• Ume (Japanese apricots)
• Berries such as strawberries
• Cherries
• Apricots
• Plums
• Kiwifruit
• Tomatoes

The amount of malic acid in a food can vary according to factors such as variety, ripeness, growing conditions, storage and processing.

For that reason, rather than relying on a fixed ranking of which food contains the most malic acid, it is more useful to think of it as one of the organic acids naturally present in many fruits and vegetables.

Does a More Sour Apple Contain More Malic Acid?

As fruit ripens, the balance between organic acids and sugars changes, which can alter how tart it tastes.

However, the sourness we perceive is not determined by malic acid alone.

Sugar content, other organic acids, aroma compounds and the overall flavour balance all influence how a fruit tastes.

That is why one apple variety can taste noticeably sweeter or sharper than another even though both contain malic acid.

What Is the Difference Between L-Malic Acid, D-Malic Acid and DL-Malic Acid?

Once you start reading more about malic acid, you may suddenly come across the terms “L-malic acid,” “D-malic acid” and “DL-malic acid.”

This is where the chemistry of malic acid becomes particularly interesting.

L and D Are Like Your Right and Left Hands

Malic acid can exist in two forms that share the same molecular formula but differ in their three-dimensional arrangement.

These are called enantiomers, or mirror-image isomers.

A simple way to picture this is to think of your right and left hands.

They look very similar and are mirror images of one another, but you cannot place one directly on top of the other and make them match perfectly.

Malic acid has a similar relationship between:

• L-malic acid
• D-malic acid

These two forms are mirror images of each other.

L-Malic Acid Is the Form Commonly Found in Foods

In plants and naturally occurring foods such as apples, L-malic acid is the predominant form.

The malate involved in human energy metabolism also corresponds to this naturally occurring form.

What Is DL-Malic Acid?

DL-malic acid is a mixture containing both the L and D forms.

It can be manufactured chemically and is used in foods for purposes such as adjusting acidity and pH.

DL-malic acid is also recognised as a food additive in Japan.

The simplest way to understand L, D and DL is to think of them first as different three-dimensional forms of the malic acid molecule.

We will look more closely at food additive uses and safety later in this article.

What Does Malic Acid Do in the Body, and What Is It Good For?

One of the most fascinating things about malic acid is that it also appears naturally inside the human body.

Malic Acid Is Part of the Citric Acid Cycle

Our cells use nutrients from carbohydrates, fats and proteins to produce the energy needed for everyday life.

One of the central pathways involved in this process is the citric acid cycle.

It is also known as the TCA cycle or Krebs cycle.

Within this cycle, several different compounds are converted from one form to another in sequence.

Malate appears in the later part of the cycle.

In simplified form, the sequence includes:

Fumarate → Malate → Oxaloacetate

Oxaloacetate then helps the cycle begin again.

When malate is converted to oxaloacetate, NADH is produced, contributing to the wider process that ultimately supports ATP production.

The Role of Malic Acid in the Body and the Meaning of Dietary Intake Are Different Questions

This is an important point when understanding malic acid.

Malate is well established as a compound involved in cellular energy metabolism.

At the same time, our bodies continuously produce and transform many different compounds, and energy metabolism is controlled through a complex network of biochemical reactions.

For that reason, it is helpful to distinguish between the role malate plays inside the body and what can be expected from consuming additional malic acid in food.

So What Is Malic Acid Actually Good For?

Here are some of the roles and uses of malic acid that can be described relatively clearly.

• It contributes to the refreshing tartness of fruits and vegetables
• It is an intermediate in human energy metabolism
• It is used to adjust acidity and pH in foods
• It is used to help shape flavour in foods and beverages
• It may be used as a pH-adjusting ingredient in cosmetics and hair care products
• It belongs to the group of compounds known as AHAs, or alpha-hydroxy acids, in cosmetic science

Malic acid has also been studied in relation to areas such as fatigue, exercise, beauty applications and combinations with minerals.

When looking at this research, it is important to consider the amount used, the combination of ingredients and the study conditions separately from simply eating foods that naturally contain malic acid.

Claims involving fat burning, weight loss, detoxification, lowering blood glucose, relieving constipation, preventing colds, skin whitening or hair growth are better understood in the wider context of overall nutrition, lifestyle and, in the case of cosmetics, the complete product formulation rather than malic acid alone.

When thinking about health and beauty, looking at the whole diet, lifestyle and product formulation gives a more useful picture than focusing on a single ingredient.

Rather than being a universal “health ingredient,” malic acid is perhaps more interesting as a familiar organic acid that appears in nature, human metabolism and food production.

What Is the Difference Between Malic Acid and Citric Acid?

Malic acid is often compared with another familiar organic acid: citric acid.

Both occur naturally in foods, both are used as acidulants, and both appear in the citric acid cycle.

Chemically, however, they are different compounds.

Because it is called the “citric acid cycle,” it may sound as though citric acid is the only important compound involved. In reality, several compounds — including malate — appear one after another throughout the cycle.

Malic acid and citric acid are not rivals; they are different organic acids that even appear within the same metabolic pathway.

That is a useful way to remember the difference.

Where Can You Get Malic Acid? Foods, Ways to Eat Them and How to Include Them

Malic acid is not an unusual or exotic compound. It is naturally present in many foods we already eat.

Fruits and Vegetables Are Common Sources

Examples include:

• Apples
• Pears
• Grapes
• Ume (Japanese apricots)
• Berries such as strawberries and raspberries
• Cherries
• Apricots
• Plums
• Kiwifruit
• Tomatoes

Rather than eating large amounts of one particular food simply for its malic acid content, enjoying a variety of seasonal fruits and vegetables as part of your usual diet is a more natural approach.

Fruits and vegetables also provide much more than malic acid, including fibre, vitamins, minerals, polyphenols and many other naturally occurring compounds.

Should You Eat Apples with the Skin On?

Malic acid is present in the flesh of apples as well, so eating the flesh still provides malic acid.

The skin and the area close to the skin also contain other plant components, including fibre and polyphenols.

If you enjoy eating apples with the skin on, wash them thoroughly under running water and enjoy them whole or thinly sliced.

What About Whole Fruit, Vegetables or Juice?

Malic acid can also be obtained from fruit juice and processed foods.

From the perspective of the whole diet, however, whole fruits and vegetables also provide components such as dietary fibre.

If you enjoy juice, it can be useful to consider factors such as added or total sugars as well as malic acid, and choose it as part of your overall diet.

Do Apple Cider Vinegar and Wine Contain Malic Acid?

Malic acid may also be present in fruit juice, wine, vinegar and other processed products.

However, the composition of organic acids can change during processing, fermentation and ageing.

In winemaking, for example, a process known as malolactic fermentation may convert malic acid into lactic acid, meaning the amount of malic acid can vary depending on how the wine is produced.

This is one of the interesting details of food chemistry: a product made from apples does not automatically contain a large amount of malic acid.

Do You Need a Malic Acid Supplement?

Malic acid is not classified as an essential nutrient in the same way as nutrients such as vitamin C or iron, where deficiency can lead to specific deficiency conditions.

For most people, the basic approach is therefore to enjoy a varied diet rather than trying to supplement malic acid specifically.

Supplements may use names such as “malic acid” or “magnesium malate.”

Magnesium malate is a salt formed from magnesium and malic acid, so it is not the same substance as malic acid alone.

Even when the word “malate” appears in the name, it is worth checking which compound the product contains and how much of each ingredient is present.

Malic Acid in Food Additives, Cosmetics and Hair Care

The story of malic acid does not end with fruit on the dining table.

It is also used in food manufacturing, cosmetics and hair care products.

In Food: Acidulants and pH Adjustment

Because malic acid provides a refreshing tartness, it is used to adjust flavour in beverages, sweets, jellies, candies and other foods.

It may also be used to help adjust the pH of foods.

In Japan, depending on the purpose of use, it may appear on food labels under categories such as acidulant or pH adjuster.

Internationally, malic acid is known as INS 296, while in the European E-number system it is identified as E296.

How Should We Think About Malic Acid in Fruit and Food Additives?

Naturally occurring foods predominantly contain L-malic acid, while DL-malic acid may be used as a food additive.

There are differences in origin and stereochemical form, but when considering food additives, it is useful to look beyond whether something is natural or synthetic and consider its intended use, amount, specifications and safety evaluation.

Is Malic Acid Used in Cosmetics?

If you look closely at cosmetic ingredient lists, you may sometimes find malic acid listed.

Chemically, malic acid belongs to the group of compounds known as alpha-hydroxy acids (AHAs).

In cosmetics, it may be used for purposes such as adjusting the pH of a formulation.

AHAs are also known as a group of ingredients associated with exfoliating or surface-smoothing skincare applications, but how a finished product behaves depends on factors such as the amount of malic acid used, the overall pH, the other ingredients in the formulation and whether the product is rinsed off or left on the skin.

When you see “malic acid” on an ingredient list, it is therefore useful to look at the purpose and directions of the complete cosmetic product.

Using Apples or Apple Cider Vinegar Directly on the Skin Is Different

Malic acid occurring naturally in food and malic acid used in a carefully formulated cosmetic should be considered differently when it comes to skin use.

Apple cider vinegar and fruit juice from the kitchen are not formulated for the skin with controlled concentrations, irritation potential or pH.

If you are interested in malic acid as part of a beauty routine, the practical approach is to choose a cosmetic product designed for skin use and follow its directions.

Why Is Malic Acid Used in Shampoos and Hair Care?

Malic acid may also be included in shampoos, conditioners and treatments for purposes such as pH adjustment.

The way a hair care product feels and performs is created by its overall formulation, including conditioning ingredients, oils, polymers and cleansing agents rather than by a single ingredient alone.

When malic acid appears in a hair care product, looking at the complete formulation and intended use provides a more useful picture than focusing on malic acid by itself.

What Is Calcium Citrate Malate?

When researching malic acid, you may also come across the term calcium citrate malate.

This is not simply malic acid. It is a calcium material formed using calcium together with citrate and malate.

It has been studied and used as a source of calcium, and it is best understood as a separate compound from ordinary malic acid.

The same idea applies to compounds such as magnesium malate, which is a compound formed from magnesium and malate.

Even though they share the words “malic” or “malate,” malic acid itself and mineral malates should be considered separately when reading information about their uses.

Malic Acid Safety and Frequently Asked Questions

Is DL-Malic Acid Safe as a Food Additive?

DL-malic acid is used as a food additive in Japan and in many other countries.

The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has assigned an ADI of “not specified” to DL-malic acid and certain related salts.

This classification means that, when used appropriately for its intended technological purposes in food, a numerical acceptable daily intake was not considered necessary.

Food additive safety is best understood by considering not only an individual ingredient, but also permitted uses, relevant standards and overall dietary exposure.

Is There a Daily Limit of 1.2 g?

You may come across claims online that malic acid should be limited to “1.2 g per day.”

Under current international food additive evaluations, however, there is no universal official upper limit of 1.2 g per day for malic acid for the general adult population.

Malic acid is also not an essential nutrient, so there is no recommended daily intake comparable to those established for vitamins and minerals.

If you use a concentrated supplement, follow the serving instructions and precautions provided for that specific product.

Can Malic Acid Whiten Teeth?

You may see beauty tips suggesting that malic acid, apples or apple cider vinegar can help remove stains or whiten teeth.

One important thing to remember is that malic acid is, quite literally, an acid.

Frequent or prolonged exposure of the teeth to acidic foods and beverages is associated with dental erosion of the enamel surface.

To enjoy acidic foods and drinks while being gentle on your teeth:

• Avoid holding acidic drinks in your mouth for long periods
• Rather than sipping acidic drinks continuously over a long period, enjoy them with meals or at defined times
• Rinse your mouth with water afterwards
• After acidic foods or drinks, avoid brushing forcefully straight away and allow some time before your usual brushing routine

If tooth colour is a concern, speaking with a dental professional can help you choose an approach suited to your teeth rather than relying on acidic foods for whitening.

Is Malic Acid Good for Fatigue?

Malate is part of the citric acid cycle and contributes to cellular energy metabolism.

Dietary malic acid, however, is best considered separately from the biochemical role that malate performs inside the body.

Fatigue can be influenced by many factors, including diet, sleep, hydration, physical activity and stress.

A useful way to understand malic acid is as one of the compounds involved in the body’s energy metabolism.

Is Malic Acid Good for Weight Loss?

Because malate appears in energy metabolism, malic acid is sometimes discussed alongside terms such as “fat burning” or “metabolism.”

For weight management, however, it is more useful to consider total energy intake, diet quality, physical activity, sleep and lifestyle as a whole.

When apples and other fruits are included in the diet, they provide not only malic acid but also fibre and a range of naturally occurring plant compounds.

Is Malic Acid Good for Beauty?

Malic acid is used in some cosmetic products, but eating malic acid in food and using it as part of a cosmetic formulation are two different applications.

In cosmetics, the intended use and feel of the finished product depend on factors such as concentration, pH and the combination of ingredients in the complete formulation.

From a beauty perspective, separating malic acid as a food component from malic acid as a cosmetic ingredient makes the available information much easier to understand.

Can Pregnant Women and Children Eat Foods Containing Malic Acid?

Malic acid naturally occurs in everyday foods such as apples, grapes, pears and tomatoes.

When these foods are eaten normally, malic acid can simply be considered one of their naturally occurring food components.

For processed foods intended for infants and young children, follow the stated age guidance and product labelling. Supplements and highly concentrated products should be considered separately from ordinary foods.

During pregnancy or breastfeeding, for infants and young children, or for people with medical conditions, check the product information before using supplements and seek professional medical advice when appropriate.

So What Is the Best Way to Include Malic Acid in Your Diet?

The answer is surprisingly simple.

Enjoy a variety of fruits and vegetables — such as apples, pears, grapes, ume, berries and tomatoes — as part of your everyday diet.

When you eat a varied diet like this, malic acid naturally becomes part of the foods on your table.

And perhaps the most interesting thing about malic acid is not any single claimed health benefit.

The same compound appears in the refreshing tartness of apples, in food manufacturing, in cosmetics and in the energy metabolism taking place inside our cells.

The acid you taste in an ordinary apple is also a familiar name in the chemistry happening inside the human body.

Once you know that, your everyday apple may look just a little more interesting.

※ This article provides general information about malic acid, foods, food additives and cosmetic ingredients. It is not intended to diagnose, treat or prevent disease, or to claim specific effects from any food or ingredient.

※ When using food additives, supplements or cosmetics, follow the directions, serving guidance and precautions provided for each product.

References

1. PubChem, National Library of Medicine. Malic Acid / L-Malic Acid.
2. NCBI Bookshelf. Biochemistry, Citric Acid Cycle.
3. FAO/WHO Joint Expert Committee on Food Additives (JECFA). DL-Malic Acid.
4. Consumer Affairs Agency, Japan. Resources on Food Additives.
5. Ministry of Health, Labour and Welfare, Japan. Food Additive and Labelling Resources.
6. Cosmetic Ingredient Review. Safety Assessment of Malic Acid and Sodium Malate as Used in Cosmetics.
7. American Dental Association. Dental Erosion.