Colloidal Silver is helpful for supporting the immune system and treating cat colds

Colloidal Silver has anti-microbial activity

Colloidal Silver for cats,antibiotic for cats,antiviral for cats,urinary tract infections in cats,wound healing in catsColloidal Silver's anti-microbial activity means that it has anti-bacterial, anti-viral, and anti-fungal properties. In my experience, it truly is an amazing product as a natural medicine for cats, as well as dogs and humans too!  Cat rescues could save a lot of money by using Colloidal Silver in place of stressful trips to the veterinarians and bad tasting antibiotics that end up all over cats*. Many holistic animal practitioners and veterinarians use Colloidal Silver for their patients. 

Elemental silver has documented use dating back thousands of years. It's anti-microbial activity is acknowledged by the CDC, FDA and WHO.

Colloidal Silver touts these benefits:

  • non-toxic, so it will not damage or tax organs like prescription medications can do
  • no side effects when used as directed
  • works as a antibiotic, anti-viral, and anti-fungal (very effective in my experience)
  • does not kill off friendly gut bacteria, like antibiotics do
  • helps wounds heal faster with oral and external application (dab on with a cotton square)
  • nearly tasteless and odorless, making it acceptable by cats
  • faster recovery from infections

Some conditions I have used Colloidal Silver for with cats (mostly rescue and foster cats):

  • urinary tract infections
  • upper respiratory infections
  • post-surgery
  • Feline Leukemia (FeLV) and Feline Herpes

I have treated cats with Colloidal Silver after dental extractions, anal gland surgery, and hernia surgery. With no prescription antibiotics. The veterinarians were aware of my decision. All cats healed up quickly and cleanly. This does not imply you will have the same results. There are other factors in play, with quality of food being a major factor in the body's ability to heal and fight infection. The cats I treated were being fed homemade raw food and high quality canned food. Never dry food.  They were also receiving homeopathy to assist healing and reduce inflammation from the surgery. (*Please Note: If you'd like assistance with this, please contact me by email for a consultation. I'm unable to make recommendations in the comments section. Each situation and cat is unique, and suggested treatments are individualized and can involve lengthy instructions.)

There have been situations where the cat or kitten was so sick, that I chose to use prescription antibiotics. 

Frequency of use

According to the EPA, a human may safely ingest 178,850 servings of Sovereign Silver over a 70-year period.  As the EPA does not test the product on cats, this is just a comparison as to its safety with daily use. 

Cats with FeLV, FIV, or any other immune system dysfunction are at a higher risk for other bacterial and viral infections.  Colloidal Silver can be used as a daily immune system support and protectant.

Personally, I don't like to use the same product every single day. I believe (as do many holistic animal practitioners) that it is best to cycle supplements. This way, the body does not become accustomed to something and no longer benefit from it.  If I use it daily as an immune system protectant, I use it for three weeks on, and one week off. This is a typical regimen given by holistic practitioners and some supplement companies for long-term use of a natural supplement. Another option is to administer six days on and one day off. 

Primarily, I use it to treat specific conditions, such as feline upper respiratory infections or post surgery healing. In these cases, I use it two to three times daily until the condition has cleared or surgery incision has healed. The situation determines how many times per day. I administer as follows:

If the cat is easy to handle, three times daily: on two meals, and once in the mouth.

If the cat is not easy to handle, three times daily: on two meals and one nighttime treat (a bit of wet food).

If it is a kitten and very sick, four times daily in four meals or in the mouth by dropper.

Cats that I have treated have never encountered any adverse reactions. 

Dosage for cats

Sovereign Silver has a pet formula, but really, it's the same as the "regular" formula. I think that offering a "pet" formula helps more with marketing. So, you'd be okay to use one or the other and use it for humans and cats (dogs, too). Personally, I have never used the "pet" formula. It wasn't available in the past when I began using Colloidal Silver. 

Sovereign Silver's recommended dosage is as follows for pets (using a 4 oz. bottle size with dropper):

Weight in lbs & kg -- Droppers full:

3.5- 7 lbs (1.6-3.4 kg) -- 1 

7.5-10.5 lbs (3.5-4.9 kg) -- 2 

11 lbs-14.5 lbs. (5-6.9 kg) -- 3

15 lbs-18.5 lbs. (7-8.4 kg) -- 4

19 lbs-22.5 lbs. (8.5-9.9) -- 5

Note: 5 droppers = 1 teaspoon


Maintenance: 1x daily

Immune Building: 3x daily

How to administer Colloidal Silver to cats

Colloidal Silver can be added to cat food and mixed in.  I have never had a cat turn down their food with Colloidal Silver in or on it.  If your cat is not eating, and you are feeding with a dropper or giving liquid supplements, Colloidal Silver can be added to the mix. For eye infections, it can be used to gently wipe the eyes clean with a cotton square, as it will not burn the eyes.

Colloidal Silver is great to have on hand for yourself as well

Anytime I get run down from stress and too little sleep, I will start to get a sore throat.  Just two full droppers onto the back of my throat almost always stops the sore throat in its tracks.  On occasion, I will need to take a second dose a few hours later. 

My favorite brand - Sovereign Silver

*Disclaimer: This post contains an affiliate link, which means I receive a very small commission if you purchase through links I provide (at no extra cost to you). It is a great way to say thanks if you find my information helpful for you and your cat. I personally use or have used any products I recommend. 

Sovereign Silver's Bio-Active Silver Hydrosol is the brand I recommend and have used for many years.  It is the #1 selling brand in the U.S. It contains 98% positively charged silver in pharmaceutical-grade purified water, and nothing else.  On the contrary, some brands contain salts, proteins, compounds or stabilizers, and they may or may not claim to contain these ingredients.  These added ingredients affect silver's safety and efficacy. 

A silver's molecular particle size determines the absorption rate by the body. 

Sovereign Silver's particle size is highly absorbed at 0.8mm. This is an industry low amongst competitors.  With this low particle size, its 10 ppm (parts per million) is more effective than other brands containing up to 500 ppm.  So, don't be fooled by the higher ppm's of other brands.

Where to buy Colloidal Silver

You can buy Sovereign Silver and other brands at health food stores and on-line supplement stores.  You can also buy it on Amazon for a better price.  Check it out here:  buy colloidal silver

*I am not a veterinarian nor am I prescribing colloidal silver in place of antibiotics in cats who are extremely ill . But simply suggesting to give it a try for common upper respiratory infections and supporting cats with weakened immune systems. You will be pleasantly surprised. 

Do you have any experience using Colloidal Silver with your cats? Let us know in the comments below. Thanks!

Photo Kim and Clancy2


Kim Staley
Healthy Life Cat Coach

Colloidal Silver for Treating Cat Colds

18 thoughts on “Colloidal Silver for Treating Cat Colds

  • October 20, 2016 at 1:18 am

    I’m so glad you wrote this, Kim, as I didn’t really know anything about colloidal silver. It sounds like a great thing to have on hand! And what a bonus that they’ll eat it mixed into their food, too! Such helpful info- thank you 🙂

    • October 20, 2016 at 9:58 am

      You’re welcome Elizabeth. I cannot give enough praise to colloidal silver.

  • June 16, 2017 at 10:11 am

    I’m curious to know how many drops and how many times daily? Thanks

    • June 16, 2017 at 11:54 am

      Hi Catherine, thanks for visiting my site and reading this article. Since I’m not a doctor/veterinarian, I cannot prescribe dosages. But I can tell you what I do based on what I’ve researched among holistic animal practitioners. It’s really difficult, rather impossible, to overdose or overuse colloidal silver, especially this brand. Using the adult dose on the label as a reference point for oral use, cut amount in half for a child or medium sized dog. Then cut in half again for a cat or small dog. Bringing you to 1/4 the adult dose. I just use a dropper-full from the 4-oz bottle. If I have the 8-oz bottle with the larger dropper, I use 3/4 of a dropper or so.

      Sovereign Silver’s label indicates how many times per day depending on severity of symptoms up to 7 times daily or if you’re using as daily maintenance, once daily. You might get some resistance or hiding cats if trying to use 7 times a day! I have used it 3-4 times per day per holistic animal practitioners & veterinarians. This would include 2 doses going in 2 meals per day and 1-2 doses going in the mouth. If it’s a kitten eating 4 times per day, then there are your 4 doses. To give in the mouth, dropper into corner of mouth on gums and try not to touch dropper to the mouth. You don’t want to squirt it into the back of their throats, as this can make them choke/cough and scares them.

      All the best to you and your cat(s).

      • February 11, 2020 at 12:43 am

        thank you! can i use it ongoing?

        • February 13, 2020 at 12:31 pm

          Hi Catherine, according to Sovereign Silver’s website, it can be used for pets, adults and children once daily for maintenance. There’s really no need to use it ongoing, except perhaps you wish to if a cat has an immune system dysfunction, FIV, or FeLV. If you want to use it ongoing, a general rule of thumb is to take a supplement/herb 6 days on and 1 day off for rest.

          • February 13, 2020 at 7:04 pm

            thank you that helps. My two new cats have been sneezing for 2 weeks. Seem to finally be getting over it so I just wanted to make sure if I keep giving it to them until they stop sneezing it’s ok.

        • February 17, 2021 at 9:44 am

          We adopted an elderly cat who is sneezing blood sometimes a thin spray sometimes a larger dry chunk. Conventional vet medicine doesn’t have a solution. I’m going to use colloidal silver since we’ve used it ourselves. I thought that spraying the colloidal silver in the cat’s nose would be most effective. Do you have any recommendations in regards to that?

          Also, I tried years ago to feed my cats a raw food diet. The problem I had is that the cats started eating all the vegetables I was preparing for the humans in my family. With little kids, I get pulled away from my kitchen only to find the cats eating our dinner on the counter. Do you not have that problem because you keep your food put away except when you are actively preparing it?

          • February 17, 2021 at 3:24 pm

            Hi Toby,
            Spraying in a cat’s nose will startle them and your cat will most likely not like it at all. This will work best orally. Either use the dropper and slowly dropper colloidal silver into your cat’s mouth or add to his or her food. Follow the label for dosage frequency. You’ll need to administer more than two times per day for an active infection. If you feed only two times per day, then two more times by mouth with the dropper. For eye infections, colloidal silver can be applied to the eyes with a cotton ball. Colloidal Silver alone may or may not work to clear up the infection. If you need further assistance, please feel free to set up a consultation with me, or consider seeing a holistic or homeopathic veterinarian.

            My cats love vegetables too! But not near as much as raw meats/poultry. My experience is that they need some fiber too, as they would get from their prey or eating grass if they go outdoors. Eating only raw meat/poultry and bones constipates one of my cats, the female. The other two are okay without fiber, but they still like other goodies. Yes, my cats are always trying to sneak food off the counter when I turn my back. I’m always chasing them off. They are probably just bored and exploring to look for some excitement–i.e., trouble 🙂 Thanks for stopping by Cats Gone Healthy.

  • May 3, 2018 at 8:20 pm

    Hi ..I have a cat with FIV that has a chronic respiratory thing going on and antibiotics help for a while but it always comes back he won’t eat wet food so I syringe Colloidal in his mouth he’s a big cat and I was wondering how much I can give him in tsp. dosage everyday to get rid of this and a daily maintenance dose
    Thank you

    • May 28, 2018 at 8:55 am

      Hi Wendy,

      First, I want to say a big Thank You for taking in and caring for an FIV positive cat. He is very fortunate to have someone to care for him and that his life was not ended in an animal control facility due to having FIV. Cats with FIV can live long lives, as you probably already know. Secondly, I want to apologize for not responding sooner. I had some life stuff going on and not tending to my website for several months. Your question was answered in reply to someone else who had the same question, and it appears just above yours. Please refer to it, and my answer is based on the brand of colloidal silver I use and recommend. But if you use a different brand, you can follow the same guidelines.

      In regards to your cat not being willing to eat canned food, cats can become addicted to dry food and be very resistant to changing over to canned or homemade cooked or raw food. Feeding him canned, homemade cooked or raw food would help him have a stronger immune system and maybe stop getting these recurring colds because dry cat food requires the cat’s system to work harder, it is not fully digested and turns into excess fat, and is not utilized by their bodies to nourish our cats. Getting them to change over requires a lot of tough love and patience! You might consider getting some assistance with changing his diet to one more species appropriate. Be sure to check out my Thrive Nutrition Programs. At the very minimum, be sure to avoid corn, wheat, soy, and by-products in dry foods. Although, I’m not at all hip on the beans and green peas now being used–all of which are not species appropriate protein sources. Those come with another set of problems.

      Finally, there are many variables involved when we are looking at strengthening our cat’s immune systems. Household cleaning products, spray and plug-in air fresheners, laundry products, and even food and water bowls. You can watch my Healthy Cats Detox videos to help your cat have a healthier immune system here:

  • October 6, 2018 at 12:14 pm

    Dear Kat, hello and thank you for helping rescue animals! I totally understand because I have volunteered at an animal rescue where I worked in the on-site “cat hospital.” It’s really tough to treat them with so many together. Some will improve, then more sick ones are exposed to the improving ones, and it just keeps passing around. In my opinion and experience, using Colloidal Silver alone won’t help a cat recover from a URI. There are many factors playing into building the immune system, with quality of food being a major player. No doubt, rescues struggle with funding, and using the best quality food is usually out of the question. If at all possible, at least avoid dry food that contains corn, soy, wheat and artificial colors. Those are your biggest offenders–the lowest quality ingredients that weaken the immune system. Administering Colloidal Silver two times per day should be enough to help. Is it possible to serve a little dollop of wet food on top of the meal of dry food? The Colloidal Silver does not need to be mixed in, this is just more work for the staff. Just dropper it right onto the wet or even just the dry food. Are the cats all together eating out of the same large platters of dry food or are they separated with individual meals? Because if they are all together, of course, it’s impossible to know who is getting how much, if any, Colloidal Silver.

    They need something else to help strengthen the immune system. I have used classical (single remedy) homeopathy with great success. However, it is very specific to individual symptoms. What works for one may not work for the other cat. Holistic Animal Medicines is an on-line supplier in Australia of homeopathic formulas, including formulas for URI in cats. They have changed their website since I last ordered a few years ago. They used to offer individual formulas rather than having to buy the whole set. You could email them and explain the situation that it would be difficult to administer all the items in the set to so many cats. They may sell you just the #1 Virus Respiratory item. When I worked at the rescue, Holistic Animal Medicines instructed me to add drops of one of their infection fighter products (I don’t recall which one) into a spray bottle of distilled water, and spray the water and dry food platters two times per day. This was for 200 cats! If the bottle didn’t get used quickly enough though, mold could start growing in it. The spray bottles needed to be kept in the fridge to help prevent mold from growing as quickly. The rescue owner and volunteers said they saw improvement in the cats. In the “cat hospital” of 20-30 cats, I wrote instructions on cat’s medical care clipboards for the other volunteers to administer two times per day. Some people did it if they remembered, but it was better than nothing.

    The other thing I have used for URI is electrolytes, as most cats with a URI are losing them in their bodily fluid excretions, further weakening them. I used Bounce Back, which is in powder form and mixed with water in small batches when you need it. It is nearly tasteless and odorless like the CS.

    To answer your question about serving CS in stainless steel bowls, I never heard of that being a problem. The CS will be on the food only a short period of time. And again, just dropper it on top of the food, rather than mixing in where it would have more chance of contact with the bowls. Just make a little well with the spoon in the canned food to hold the CS. They will hopefully lap it right up. Not eating due to the URI? Has to be administered in the mouth and you can wipe their little noses with cotton pad soaked in CS.

    To answer your other question about adding CS to subcutaneous fluids, being I am not a veterinarian, I have no idea about that. I have never come across it or searched for that. Holistic Animal Medicines is big on CS, and I have not seen any mention of using CS in a sub-q manner. I certainly recommend to not administer it intravenously without the instruction of a medical professional who knows how to use it in that manner. All the best to you and the kitties! Please keep me posted. I would love to hear if you see any improvement with any of these suggestions.

  • November 16, 2019 at 11:20 pm

    Please be aware that colloidal silver will kill any and all single celled organisms it encounters, and that includes the gut bacteria that mammals use to digest food. So silver taken internally will kill some gut bacteria in cats, who have notably short digestive tracts. Impact on gut bacteria can be minimized in humans by holding the colloid solution in the mouth for a feew minutes, whereby the silver is absorbed by mouth tissues, moving directly to the bloodstream and avoiding the gut. This would be difficult to achieve in most cats, thus use of colloidal silver internally in cats should be accompied by gut flora supports such as probiotics, yogurt, or kombucha.

    • December 5, 2019 at 12:20 pm

      Hi Fred, Thanks for visiting Cats Gone Healthy and for your input on colloidal silver. There are varying opinions on whether CS kills off all gut bacteria, including the healthy “friendly” bacteria. There are some studies whose results show that it does not kill off all bacteria, but rather has an attraction to the unhealthy damaging bacteria and then killing it off. In all the years of using CS, I’ve never encountered symptoms of it destroying the healthy bacteria. I’ve also followed many holistic animal practitioners and veterinarians who highly recommend CS, but don’t mention the necessity of using probiotics along with it for the reasons you’ve noted. Probiotics certainly can’t hurt, but are good for cats who’ve been on antibiotics and/or poor quality food. Cats should not really be fed dairy products, such as yogurt, as a source of probiotics. Dairy often causes intestinal upset, i.e. diarrhea. They seem to be okay with goat’s milk, though. There’s pet supplement brand whose main product is goat’s milk. My cats didn’t like it at all and neither do I, so it was a costly waste. Not too sure a cat will consume kombucha. But then, you never know with cats! The best choice would be simply a probiotic supplement.

  • March 2, 2020 at 2:09 pm

    Is there such a thing as a herxheimer’s reaction in cats? As I used colloidal silver for two days for my two cats (one of whom is a kitten) upper respiratory infections and, unfortunately, they got worse. I used suggested doses. I stopped the dosages after two days,

    • March 3, 2020 at 9:59 am

      Hi Vicki,
      Thanks for visiting Cats Gone Healthy and for your inquiry. Yes, I know from personal experience that cats can have a “herxheimer’s type reaction to detoxing. This typically happens when changing from commercial cat food to a better quality homemade food and when treating conditions with homeopathy. Using antibiotics can cause a reaction as the bacterial infection die off. This is due to the fact that antibiotics also kill off the healthy bacteria and gut microbes, which keep the gut in check. The reaction causes intestinal upset. As far as having this type of reaction from using Colloidal Silver (not an actual antibiotic drug), I have never experienced a negative reaction from it’s use. CS does not kill off healthy gut bacteria. It has only an attraction to the unhealthy, positively charged bacteria. But it’s always possible your little ones had a reaction of getting worse before better. Or, they were on the way to worsening whether or not you started with Colloidal Silver. URI’s in cats are usually viruses, not bacterial. Two days is not enough time for Cplloidal Silver to work when they are in full-blown URI’s. In my experience, Sovereign Silver Colloidal Silver works wonders at the first sign of an infection coming on, often stopping it or at least lessening the symptoms.

      Please don’t give up on Colloidal Silver so soon. I have always used it in conjunction with homeopathy for my own cats at the onset of symptoms. For strays I’ve picked up who are already sick, I use Colloidal Silver, homeopathy and other supplements to build their immune systems back up. Homeopathy is very individual and symptom specific as far as choosing the correct remedy and usage.

      And always, no dry cat food! Too many toxins, too difficult to digest, too low in natural nutrients, all of which puts more of a load on already compromised organs and immune system. Let me know if you’d like a consultation to help you with them or a referral out. Send me an email through the Contact.

  • April 8, 2020 at 6:25 pm

    I have 3 kitties only 2 have coughed or sneezed should I just treat the 3rd one also?

    • April 11, 2020 at 8:46 am

      Hi Sandy, if it were me, I would use the Colloidal Silver on the 3rd one also. Since it’s a good chance the 3rd kitty will inhale, or ingest during grooming, the particles that kitties #1 and #2 are spewing out. Colloidal Silver can be used as a daily immune support and protectant. One does not have to be or appear “sick” to take it. It would be best if you can separate them, but I’m sure by now that kitty #3 has already ingested virus particles. Be sure to consider quality of food, as this has a big effect on the immune system and ability to ward off infections. Thank you for visiting Cats Gone Healthy!


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