Rx Vitamins Liquid Immuno Dog and Cat Immune Support – L-Lysine for Cats – Reishi Mushroom Supplement for Dogs – Feline & Canine Immune System Support – Bacon Flavor – 4 oz
$35.90


Price: $35.90
(as of Oct 23, 2025 12:52:16 UTC – Details)
Liquid Immune (Original Flavor) by Rx Vitamins for Pets contains a blend of ingredients that may work to support your pet’s immune system. First‚ Liquid Immune (Original Flavor) provides reishi mushroom extract. According to proponents of traditional Chinese medicine‚ this mushroom may help address certain symptoms associated with mild upper respiratory infections.
Is Discontinued By Manufacturer : No
Product Dimensions : 2.4 x 2.3 x 1.8 inches; 7.2 ounces
Item model number : 708429088042
Date First Available : June 5, 2010
Manufacturer : Fulfillment Advantage Ventures, Inc
ASIN : B00FZPRGCU
Best Sellers Rank: #52,087 in Pet Supplies (See Top 100 in Pet Supplies) #427 in Dog Multivitamins
Customer Reviews: 4.4 4.4 out of 5 stars 164 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Rx Vitamins for Pets – Liquid Immune 4 oz
A palatable, liquid format
Designed to support and improve immune system function
Customers say
Customers find the immune support supplement effective, with one mentioning it helped with chronic respiratory issues. Moreover, the product receives positive feedback for its quality, taste, and ease of administration, particularly for cats. Additionally, customers appreciate its great price. However, several customers note that it has a bad smell.
10 reviews for Rx Vitamins Liquid Immuno Dog and Cat Immune Support – L-Lysine for Cats – Reishi Mushroom Supplement for Dogs – Feline & Canine Immune System Support – Bacon Flavor – 4 oz
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$35.90
Annie Mendez –
AMAZING product!!
I have 4 cats, one of them with immune system problems; as i started to do some research on the web i found this product so i thought i should give it a try and must say it’s been almost a life saver for him. He hasnt had any relapses whatsoever, his fur is thick and shiny, his muscles are super strong! I’m also giving it to my other cats as a dietary suplement everyday and it’s worked just perfect! I mix it with Hills or Purina canned food every morning and night (2ml each), they love the flavor! The ONLY downside (for me) is that i have to have it shipped abroad since i dont live in the US, so i buy quite a few to make sure i dont run out of it. Highly recommend Liquid Immuno!!
Dk Phoenix –
My cats eyes cleared up in just a week!
My cat Amy has had issues with conjunctivitis all his life and Lysine has always been the solution. Our latest addition to the cat clan seems allergic to the supplement we used on the food though so we switched to treats we could just give to Amy. That solution ended when he got bored with the treats. This liquid is an awesome fix, we only used one dropper once per day and it was enough to clear up the eyes and stop the discharge. Wish we had discovered this years ago.
graciemae –
Wouldn’t be without this product!
Best price anywhere. I bought it from my vet for 3xs the price. Quality is the same! L-lysine in it prevents my cats from getting the herpes virus. I will never be without it. My cats are all rescues and were older when I received them. I don’t know their eating history but they will only eat dry food.so I buy Gerber’s turkey baby food and mix the liquid immune it in. Three cats to one jar!
JACQUE HILL –
Just what the vet prescribed, but easier for me to receive!
When I ordered this product for my cat, the image shown was for Liquid Immuno. At the time of writing this review, it is showing Liquid Hepato–I’m not sure why. The review is for Liquid Immuno 4 oz from Rx Vitamins for Pets.Our holistic vet prescribed this for our 19 year old female cat, who has had close to all nine of her lives, after a renal tablet was causing her to vomit very soon after taking it. Her vomiting has decreased substantially and she is much more lively since starting this product. She hates the dropper used to administer it, but we haven’t been able to get the dose to her any other way.Our 2 year old cat loves the taste of this supplement and she gets a few drops after the older one is done. The vet said all three of the cats could receive a dose, if we wanted to give it to them.Nutritional Institute, LLC has also been a fantastic vendor. The price is much less than what the vet sells it for (a huge plus) and since our vet has strange hours and we both have strange work hours, ordering it online is so much easier than getting out to pick it up. The packaging has never been damaged, the order has always been confirmed and shipped in a timely manner. I have zero complaints on the quality of this vendor.
Evilipoo –
Cats hate the taste of this–wish they would offer the chicken flavor!
Here’s the deal on this stuff:It works GREAT. My herpes cat has had a couple of flare-ups since he’s been on this, but none of them have developed into the horrible life-threatening sickness that they used to before he started taking this.It goes pretty fast. The recommended dosage is 1000 mg per day–which is a LOT. I started at 500 or so and gradually increased it to 1000. That is 4 dropperfuls a day though, so you will want to order more when you are 1/2 way through the bottle.It tastes AWEFUL. Our vet buys the chicken flavor (yellow label) and our cat literally licks it right off of the dropper. But this stuff (white label) is nasty! It even smells bad! Hopefully they will make the chicken flavor available on Amazon-I’d buy it monthly!
Winewoman –
Cats lovee it!
My cat has chronic respitory issues a nd needs to take lysine daily. I mix in with wet food and he gobbles it up!! This is a great product for animals that need lysine
Jolene P. –
Terrible!!!!
This product looks and smells like liquid poop! There is no way I could give 2ml to my cat let alone take it myself and it cannot be returned for some reason! Complete crap and crappy service!
SujoMgmt –
Bottom Line: It works
First, this is an unbiased review – not paid.I’m on my 5th bottle of Rx Vitamins Liquid Immuno. Frankly, I’m surprised I hung in there so long and continued to purchase this somewhat pricey item.I have a senior cat who is almost 18 years old and she has suffered from upper respiratory issues her whole life. It has gotten worse in the last 3 years.I haven’t been able to travel or leave her with anyone because her care and upkeep takes a lot of time.She produces a lot of snot which dries up around her nostrils and hardens. I have to use warm compresses every hour to keep her nose as clear as possible.She has been on back-to-back anti biotics for 6 months to help with this, however the last few rounds (and yes, I change medications as she becomes reisistant) have proven useless. The medication gives her diarrhea and exaccerbates the situation.She has other health issues and because of them, I make all her food from scratch. I’m a Chef by trade, so it’s not difficult. I am very picky about what goes into her diet. She gets cat supplementation in her food as guided by her Vet, and she only gets wet food. Bottom line: I have a holistic belief that given the right foods and supplements, she should be able to heal and not need anti biotics.Like I said, I am on my 5th bottle of product. And because the liquid is thick and messy, and because I’ve never been good at oral dispensing, I have mostly just added it to her food. But truth be told, I never really saw an improvement. I just hoped it was helping.But last week I was at my wits end and decided to search Amazon for something new. I ended up back on this page reading most of all the reviews you all have posted.. I decided I needed to be more consistents and started over again by using her pet syringe. I started her on 3ml twice a day for 3 days.I saw an improvement and lowered her to 2mls twice a day for days.Again, I saw an improvement. What kind of improvement? Her personality came back. She started chatting again. Her appetite increased. most importantly her nose STOPPED DRIPPING CONSTANTLY! No more nasal crusting (sorry). Her sneezing went from several dozen/per hour to a few per day. I no longer needed hot compresses on her nose.But I stayed consistent with giving this to her orally. Every morning after breakfast when she’s relaxed and about to go down for a nap. I get it down her throat easily and in mere seconds – guess I’ve improved a bit too.Honestly, I’m sometimes hard to please. So the fact that I’m writing this is a way of me saying THANK YOU from a very grateful heart! Mia (my darling cat) is super cool and keeps truckin on with the punches. I’m the one that was stressed out.But now mama and baby are both happy. I can even think about traveling again, which was OUT of the question until I got this URI under control.I’m not sure if this heals the source of her issues, or if its a temporary band aid (she’s only healthy as long as I give her this immune support). Guess I’ll cross that bridge when I get to it. Side note: I do know that REISHI mushroom is extremely healthy for people and for cats so when I saw that ingredient listed, I decided to give this product another try. So glad I did!A word of encouragement to anyone one needs it…try giving it orally. And consider that your pet may need a boosted dosage for a short period of time before dropping down to the recommended dosage on the bottle.Good luck to you and your furbaby.Thank you Rx Vitamins Liquid Immuno Dog and Cat Immune Support!!
HealthAndBeautyGirl –
Excellent product for your cats immune system. Recommended by my vet. Miami health here on Amazon is good seller of this productUpdate: unfortunately, after using this product on and off for some time, my cat developed some sort of allergy to it and cannot use it anymore. Now I’m stuck with the backup bottle that hasn’t even been opened and too late to return it. I recommend NOT to stock up on this large size bottle like I did, incase your pet also develops an allergy over time as mine did.
Amazon Customer –
worked fast for my dog’s wart