Can Cats Eat Seaweed Safely? Your Feline Diet Guide

Last updated
Updated by
Medically reviewed by
Our reviews are based on extensive research and, when possible, hands-on testing. Each time you make a purchase through one of our independently-chosen links, we may earn a commission. Learn more.

If you have a cat like me and love Sushi, you might ask yourself: Can Cats Eat Seaweed?

Yes, cats can safely eat seaweed. In fact, seaweed in moderation can be an excellent addition to your cat’s regular diet because it can help with common digestion and stomach issues.

While it’s unlikely that your cat would snack on seaweed in the wild, studies have shown that seafood-based diets like salmon and whitefish can promote your feline companion’s gut health.

As a person who has lived with my two feline friends for over a decade, I’ve seen many loving cat parents battling with the question of where seaweed falls into the mix. Many cat owners question if seaweed has nutritional benefits for their cats.

In this article, I’ll help you learn:

What Is In Seaweed?

Many people get surprised to learn that seaweed has nutritional benefits for cats. Unlike most human foods that your cat can’t draw nutritional benefits from, seaweed is a rare type that can supply nutritional help. 

Seaweed is nutrient-dense and can provide lots of essential nutrients and minerals. Here’s a table highlighting essential minerals and nutrients your cat can draw from seaweed.

Nutrient/ MineralPotential Benefit to Cat
IodineCrucial for healthy thyroid that regulates metabolic and energy levels
Vitamin A, C, E, and KMaintains healthy eyesight, skin, and coat
IronIt helps in the formation of red blood cells 
CalciumMaintains strong, healthy bones and teeth; Supports proper muscles function and nerve transmission
MagnesiumAid physiological processes like enzyme functions, nerve transmission, and muscle contractions
Omega-3 fatty acidReduce inflammation and promote healthy skin and coat
Omega-6 fatty acidContributes to the maintenance of a healthy skin

Feeding your cat seaweed in moderation can supply it with essential nutrients and minerals that support its health and well-being. 

However, you should practice moderation because excess seaweed can lead to iodine toxicity and digestive problems.

Health Benefits of Seaweed for Your Cat

Adding a small amount of seaweed to your cat’s regular diet can offer several health benefits, such as:

Immunity Boost

The biggest advantage your cat can get from seaweed is a boost to its immunity system. Seaweed is chock-full of ingredients that can protect your kitty’s body from diseases and infections, such as:

  • Anti-oxidants: The plant has vitamins C and E, beta-carotene, and various polyphenols. The antioxidants can neutralize harmful radicals and oxidative stress in your cat to support the immune system.
  • Omega-3 fatty acids: Other seaweed species can provide omega-3 fatty acids, which have anti-inflammatory properties and can influence your cat’s immune response.
  • Probiotics and prebiotics: Some seaweed specimens have beneficial bacteria that can promote a healthy gut in your cat. A balanced gut bacteria supports a robust immune.

If you feed your cat seaweed regularly, they’ll get sick less often because of a strong immune system that counters environmental allergy symptoms.

Improved Gut Health

Seaweed is a great source of fiber, making it an excellent dietary supplement to support your cat’s gut health. The fiber can help with bowel movement and prevent constipation, a common problem in cats.

Seaweed also balances your cat’s gut bacteria by promoting the growth of healthy bacteria in its gut.

Improved Thyroid Function

Iodine in seaweed can enhance your cat’s thyroid function. The thyroid gland is responsible for regulating metabolism and energy levels. 

If your cat struggles with an underactive thyroid adding seaweed to its diet can work well alongside conventional thyroid treatment. The traces of iodine in the seaweed can help stimulate the production of thyroid hormones to help reduce symptoms of hypothyroidism.

Reduced Inflammation

Seaweed is rich in anti-inflammatory compounds such as:

  • Two fatty acids (Omega-3 and Omega-6 fatty acid)
  • Carotenoids
  • Polyphenols 
  • Vitamin C

These compounds can help reduce inflammation throughout your cat’s body. The anti-inflammatory properties can be beneficial, especially if your cat has arthritis or allergies.

Organ Detox

Your cat comes in contact with toxins all the time. If your kitty drinks unfiltered tap water, it might be exposed to heavy metals that might be difficult for its liver to process.

Some types of seaweed can bind with the heavy metals in the organs to prevent them from damaging your cat’s organs. For instance, giving your cat spirulina seaweed can attract heavy metals in the liver, brain, and central nervous system and help get rid of them.

The dulse variant can cross the blood-brain barrier and extract mercury to help your cat to remove it from its system.

What Type of Seaweed Can You Feed Your Cat?

There are a variety of edible seaweed you can give to your cats. However, we want to focus only the on the best ones to add to your cat’s diet.


Dulse is a green algae that is easy for cats to digest. The seaweed variant is rich in the following:

  • Cesium, a powerful antioxidant that can boost your cat’s immune system function
  • Vitamin B12 can help your cat’s red blood cell production, nervous system function, and metabolism
  • Iron plays a role in oxygen transportation in the blood and energy production
  • Beta-carotene can help with vision, reproduction, and immune boost functions

While the above nutrients are essential for your cat, you should proceed with moderation. You should consider it as a treat regardless of the valuable nutrition your cat can get.

Irish Moss

Irish Moss is a seaweed commonly used in some ice cream, bread, and jellies. Like any other seaweed, it has many minerals and vitamins that can support your cat’s kidneys, lungs, and bladder.

However, the most notable content in Irish Moss is sulfur, which can help your cats with:

  • Protein synthesis to support growth, tissue repair, enzyme function, and overall body structure
  • Collagen formation, which is a major component of connective tissues such as skin, ligament, and cartilage
  • Detoxification to neutralize and eliminate toxins and free radicals


Besides tons of minerals and vitamins, Kombu has glutamate that can benefit your cat. The compound is  a non-essential amino acid  that can help various physiological processes in your cat, such as:

  • Neurotransmission: Glutamate serves as a signaling molecule that transmits nerve impulses between nerve cells
  • Protein synthesis: The compound is among the 20 standard amino acids that are the building blocks of proteins.
  • Ammonia detoxification: Glutamate can help your cat convert toxic ammonia into urea

How Can You Feed Your Cat Seaweed Safely?

As with any other food, practice moderation when serving your cat seaweed. If you plan to give your kitty seaweed regularly to balance out its nutrition, a small sprinkle on its food should be enough.

However, you should scrutinize where you buy your cat’s seaweed. Only consider reputable companies because the seaweeds are most likely tested for pesticides, heavy metals, and other potentially harmful contaminants.

Can Cats Eat Seaweed: In Summary

Cats can eat seaweed. The plant has many health benefits.

Despite all the nutritional benefits your cat can get from seaweeds, you should consider it a treat. Feeding too much seaweed to your cat can result in digestive issues.


Can cats eat seaweed raw?

Yes, cats can eat seaweed. Seaweed is not toxic to cats; most felines can enjoy it in small amounts. In fact, seaweed is a good source of nutrients for cats, including iodine, vitamin A, and vitamin C.

What are the benefits of feeding seaweeds to cats?

Seaweed has many benefits to cats, but the main ones include: 
Iodine supply: Seaweed can supply iodine to your cat to help the thyroid gland, which produces hormones that regulate metabolism.
Excellent source of Vitamin A: Cats can get Vitamin A from seaweed to help with vision, growth, and immune function.
Offers Vitamin C: Vitamin C is an antioxidant that can help to protect cats from cell damage.
Antioxidants: Seaweeds contain antioxidants such as carotenoids and flavonoids, which help neutralize free radicals in the body and protect cells from oxidative damage. Antioxidants play a role in supporting the immune system and reducing the risk of chronic diseases.

Can kittens eat seaweed?

While seaweed promises a lot to your cat, you shouldn’t give them to a kitten. A kitten’s digestive system isn’t fully developed and will have problems processing the plant. As a result, your kitten might develop digestion problems, which might interfere with its growth.
Your kitten’s diet should focus on specially formulated food that supports their growth and development.

What are the risks of feeding too much seaweed to cats?

Feeding too much seaweed to your cat can pose several risks and potential health issues, such as: iodine toxicity, mineral imbalance, digestive upsets, electrolyte imbalance, choking hazard, or thallium contamination.
You can avoid all the above risks by offering seaweed to your cat in moderation and selecting the appropriate varieties that are safe for feline consumption.

About Laura Martin

I'm Laura Martin. I get excited about all things cat related. I love my two cats - Dom and Kitty. When I'm not playing with my two feline friends, you can probably find me hiking. And yes, I have a 9 to 5 job. Although if you asked me I'd rather spend my time blogging and educating other cat moms and dads about what it takes to raise a healthy cat.

Get a 30% Discount!

We are thrilled to announce our collaboration with, offering an unbeatable deal on high-quality cat food to our dedicated readers.

Get 30% OFF

Leave a Comment