Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

8 Vet-Approved Food Sources of Magnesium for Cats

cat eating fish

Magnesium has a huge role to play in the normal functioning of your cat’s body, and a lot will start to go wrong without it. It’s a mineral that should be present in the correct concentration in your cat’s food, which is why it’s important to feed them nutritionally balanced and complete, high-quality cat food. Unfortunately, there are some cases where a cat may need a little more magnesium in their diet to prevent a deficiency.

It is not necessary to give your cat extra magnesium unless a vet has recommended it, as too much of this mineral in your cat’s diet can be as harmful as too little. If you want to avoid multivitamins and supplements and would prefer to add natural forms of this mineral to their diet, then giving your cat safe food sources of magnesium is your next best option. While magnesium deficiency is not common in cats, to help you on this journey, we’ve listed some foods that are safe and an excellent source of magnesium for your cat.

divider cats oct 2024

Before You Start

It’s important to know what a magnesium deficiency in your cat can look like in order to be proactive and do something about it. Below are some of the symptoms in animals and people:

  • Muscle pain
  • Weakness
  • Depression
  • Muscle trembling
  • Confusion
  • Convulsions
  • Loss of muscle control

If your cat is showing signs of a magnesium deficiency, it’s important to get them diagnosed by a vet, which they’ll do through a blood test. This will eliminate accidentally overlooking any other health conditions that your cat may have that similarly display themselves. A vet will also be able to give you advice on how to care for your cat and how to adjust their diet according to their individual needs.

Need veterinary advice but can't get to the clinic? Catster recommends PangoVet, our online veterinary service. Talk to a vet online and get the answers and advice you need for your cat without having to leave your living room — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

Chat with a vet about feeding your cat food sources that are high in magnesium and whether that will be enough for them. In some cases, your cat may have an underlying health condition that is causing the deficiency and will require further treatment and care than a diet change.

The 8 Food Sources of Magnesium for Cats

1. Fish

Can Cats Eat Sardines
Image Credit: monicore, Pixabay

Cats love fish, which is why it is present in many cat food recipes. It also contains many nutrients that your cat needs. Salmon, halibut, Atlantic mackerel, and Atlantic pollock are different types of fish that are high in magnesium.

Before feeding fish to your cat, make sure it’s cooked and has all the bones removed to prevent contamination and damage to their intestinal lining. Ensure that it is fed to your cat plain, without any herbs and spices, as these could be toxic to your cat. It should also only be fed as an addition to your cat’s diet and never make up your cat’s entire diet.

Apart from providing your cat with magnesium, fish is also packed with omega fatty acids, which hydrate your cat’s skin and gives their coat a silky feel and healthy shine. Fish is also high in protein and is packed with other vitamins and minerals that are beneficial to your cat.


2. Black Beans

Black Beans in wooden spoon with ceramic bowl
Image Credit: LookerStudio, Shutterstock

Although all beans aren’t recommended for cats, black beans are safe to eat and are high in magnesium. However, cats need a diet mostly made up of animal protein to thrive, so only give black beans as a small snack every now and then. Too much may leave your cat with an upset stomach. Further, some cats may refuse this treat altogether.


3. Brown Rice

brown rice in a wooden bowl
Image Credit: vm2002, shutterstock

Brown rice can offer benefits from the magnesium and other vitamins and minerals that it contains. Unfortunately, brown rice is often difficult for your cat to digest, and they may become bloated and gassy. White rice is a bit easier to digest. Always make sure to boil the rice and never offer it to your cat raw.


4. Pumpkin

pumpkin-pixabay
Credit: mattycoulton, Pixabay

Pumpkin is high in fiber and often listed as one of the ingredients inside many cat food recipes for this very reason. It can help treat gastrointestinal issues but isn’t always the easiest ingredient for your cat to digest.

Along with magnesium, pumpkin contains potassium, vitamins A, K, and C, and phosphorous. It should be given to your cat cooked and plain. Pureed and canned plain pumpkin are fine too. The seeds aren’t toxic but should be avoided because they are a choking hazard.


5. Spinach

Spinach
Image Credit By: ponce_photography, pixabay

This leafy green is another ingredient you may have noticed on the ingrediants of your cat’s food. It’s considered a superfood for humans and can benefit your cat nutritionally when given occasionally as a snack. Spinach contains vitamins A, E, K, B2, and B6 as well as minerals such as folate, calcium, potassium, and of course, magnesium.

As great as this ingredient is, your cat may not be a fan of the taste. You can try steaming or boiling it and giving it to your cat as is, without the stem, or mashing it up into their canned food. If your cat has health issues, check with their vet first on whether it is safe for them to enjoy this snack.


6. Oatmeal

a jar of oatmeal
Image Credit: sunxiaoji, Pixabay

Cooked oatmeal is a human food that is cat-safe, a rich source of magnesium, and provides your cat with energy. Oatmeal isn’t always well received by cats, as they may prefer a meatier snack, but if yours welcomes the new taste, you have another snack option to occasionally offer them that contains magnesium.


7. Beef

cat eating beef
Image Credit: liudmila_selyaninova, Shutterstock,

Beef is an animal protein that cats benefit from in many ways because they are obligate carnivores. Although beef doesn’t contain as much magnesium as some of the other options on our list, it is still a good source of the mineral.


8. Greek Yogurt

Greek yogurt in a pot
Image Credit: StockphotoVideo, Shutterstock

If you’ve got some plain yogurt that is non-fat and unsweetened, you can share a spoonful with your cat. Greek yogurt might be one of the few food products on our list that your cat will be attracted to because they’re able to smell the protein and fats inside of it. Of course, Greek yogurt has made it onto this list because it contains magnesium, but it’s also high in protein, potassium, calcium, and other important nutrients.

Avoid any yogurt that contains xylitol, as this sugar substitute is toxic to cats and can be life-threatening. Although most cats have no issues with plain yogurt, some might be lactose intolerant, so always check with your vet before introducing it to them.

divider cats oct 2024

The 3 Foods That Are High in Magnesium That Cats Should Avoid

Sometimes we forget that not every food that is beneficial to humans is safe for cats. Although the foods listed below are high in magnesium, they should not be fed to your cat because they’re harmful to them.

1. Dark Chocolate

chocolates
Image Credit: Alexander Stein, Pixabay

Dark chocolate is tasty and nutritious to humans in small amounts, but it is toxic to cats. More specifically, it’s the caffeine and theobromine found in dark chocolate that can lead to serious health problems in cats because their bodies are very sensitive to all of these ingredients.

Signs of chocolate toxicity in your cat are hyperactivity, vomiting, increased thirst, rapid breathing, tremors, seizures, and sometimes death.


2. Walnuts

Walnuts can lower cholesterol, ease inflammation, and lower the risk of developing certain cancers in people. It’s safe to say that they are highly nutritious and beneficial to the human body. However, the opposite is true for cats.

Although walnuts aren’t toxic to cats, they should be avoided due to their high fat content.


3. Avocados

Avocados are another food source of magnesium that you may eat daily due to their many health benefits. However, this green fruit isn’t recommended for cats. The danger with this fruit is the large seed inside that can be a choking hazard and the fruit’s high fat content, which can cause vomiting, diarrhea, and pancreatitis.

The Risks of Too Much Magnesium

It’s clear that magnesium is essential to the normal functioning of a cat’s body, and they need this mineral to form part of their diet. However, unless advised otherwise by a vet, your cat’s food should be nutritious enough and contain all the magnesium they need daily. Adding extra magnesium to your cat’s diet is unnecessary, and too much of it can be dangerous to their health.

divider cats oct 2024

Conclusion

Cats that are given high-quality cat food that is nutritionally balanced and complete shouldn’t struggle with a magnesium deficiency. If you want to add more magnesium to your cat’s diet without the use of supplements or multivitamins, you can do so naturally through food. However, it’s important to chat with your vet first to make sure it is safe to do so, as magnesium deficiencies often point to an underlying health condition that may require a specific diet and treatment.


Featured Image Credit: angnokever, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Can Cats Eat Pumpkin Pie? The Interesting Answer

Cats are obligate carnivores, meaning their digestive system is designed to digest meat, bones, and other animal body parts. Pumpkin pie is not...

10 Best Cat ID Tags in 2025 – Reviews & Top Picks

All cats should be equipped with an ID tag. Even if they aren’t regularly outside, you never know when they’re going to bolt...

Do Cats Have a Sense of Humor: Olga’s Comedic Ways

Hi, I’m Christopher! Read my introduction to learn more about me and my silly Russian Blue cat, Olga. I didn’t have a boring...

17 Canada Cat Statistics & Facts All Cat Lovers Should Know (2025 Update)

Note: This article’s statistics come from third-party sources and do not represent the opinions of this website. Cats were first domesticated around 10,000...

More related

Why Is My Cat Not Eating After Our Move? Vet-Reviewed Stressors

Moving can be a very exciting experience, but it is also a very stressful time for all involved. After all, you are packing...

NHV Tripsy For Cats Review 2025: Our Vet’s Opinion

NHV Tripsy is a feline urinary and kidney supplement aimed to soothe the lining of a cat’s urinary system, prevent the formation of...

8 Best Cat Foods for Kidney Disease in Canada of 2025: Reviews & Top Picks

Learning that your cat has a chronic condition, such as chronic kidney disease (CKD), can feel scary. Though this condition is not curable...

5 Homemade Cat Food Recipes (Vet Approved)

If you’re worried about what goes into your cat’s food, there’s one way to know for sure, and that’s by making your own...

Keep reading

Cat Nail Biting: 3 Vet-Verified Tips If Your Cat Chews & Pulls Their Claws

For the most part, cats biting nails and chewing claws is a perfectly normal behavior, and if you notice your cat doing this, there is usually nothing to be overly concerned about. Cats are fastidious groomers, constantly licking and cleaning...

brown tabby cat with green eyes lying on the sofa, bites its nails

Why is My Cat Throwing Up Yellow Liquid? 5 Vet Approved Reasons

Your cat vomiting can be concerning, but it may alarm you when they throw up yellow liquid. This colorful concoction surely could not be good, right? While yellow vomit looks incredibly unnatural, all it means is that it is mostly...

tabby white british shorthair cat vomit outdoors

Why Does My Cat Sleep Pressed Up Against Me? 5 Possible Reasons

Cats are interesting creatures that seem to be mostly content by themselves. It’s not unusual to find your cat curled up on your bed without you in it or sunbathing on the floor alone. However, some cats prefer to sleep...

cat-sleeping-on-owners-lap

3-Month-Old Kitten: What to Expect (Vet Approved)

Like children, baby cats go through specific stages of growth and development during their first year of life. As a pet parent, it’s important that you know what to look for as your kitten grows so you can best support...

Small calico kitten walking

Can Indoor Cats Get Toxoplasmosis? Vet Reviewed Signs & Prevention Tips

As cat owners, we want to keep our cats safe. But we also want to keep our family safe. It seems like when you hear about toxoplasmosis, you have to choose between your cat or your safety. Cat owners everywhere...

tired sick cat lying on bed

How to Tell if Your Cat Is Blind: 8 Vet-Verified Signs to Look For

Cats can lose their vision for many reasons. It can happen due to an injury or disease, and it can also happen as part of aging. Knowing the signs of blindness or the changes your cat may experience if they...

Blind calico cat

Vet Clinic Is Booked for the Day, What Do I Do? 5 Vet Approved Tips

Pets need to go to the vet on occasion, just like we need to visit our doctors occasionally. Often, when our pets need to go to the vet, we know in advance and can easily schedule an appointment. However, this...

man holding a cat in a waiting room at vet clinic

Cat Eye Discharge (Boogers): Vet-Verified Facts & Care Advice

Have you ever noticed a watery, goopy, or crusty discharge around your cat’s eyes? While these cat eye boogers can be gross to look at and deal with, you mustn’t ignore them. This discharge may indicate a problem that requires...

cat with eye discharge