Kirkland Triple action should really be called double action and debunked. Hyaluronic acid most likely doesn’t work when ingested orally as shown by large scale studies, and even the studies that showed promise, used 630mg, not 3.3mg , and you don’t have to be Stephen Hawking to do the math on the 3.3mg in Kirkland Joint Health Triple Action being a lot less than 630mg.
As for the type II collagen that’s a fine inclusion, but not the best ingredient it’s also at the very bottom of the viable dose at 40mg and then we have boron at 5mg, which whilst it does have a whole host of health benefits, it’s better dosed at 10mg, and its impact on joint health is mild to mediocre at best. 
All in all, there are way better joint supplements available than the measly doses in Kirkland Joint Health. Yes, it’s cheap, but with only about 50mg of relatively cheap ingredients even if the better supplements do cost twice as much, they tend to contain a daily dose of around 2-4000mg of active ingredients.
Even if you took half a dose of FlexAgain, which would make it the same price, you’d get 40X the active ingredients. It’s likely that anyone reporting positive effects from Kirkland’s joint supplement it’s down to the placebo effect rather than the negligible doses included.
Kirkland Triple Actions Amazon reviews actually aren’t too bad, which is relatively surprising under the circumstances, perhaps it’s a testament to the type ii collagen being effective, as that’s the only ingredient that is even acceptably dosed, and whilst it has been shown in some studies to have a mild improvement for OA it’s not remotely close to the best ingredient for joint pain. There are definitely a lot of fake reviews on their Amazon listing, but accounting for these the average is still likely above 3*.
Kirkland Triple Action reddit reviews tell something of a different story however, these are particularly negative and line up with what we’d expect. That the supplement doesn’t work.
Two of the three ingredients in Triple Action Joint Health are actually pretty good, but the dose of Hyaluronic acid is almost a joke.
Type II Collagen 40mg – There have been multiple studies testing the effectiveness of type ii collagen as a method of improving the symptoms of osteoarthritis and RA. However, the trials that use 40mg dosages are mostly on dogs. And whilst there have been some double blind placebo controlled trials in humans  these have shown that it’s only moderately effective in reducing pain and improving joint mobility. If this was a supplement for dogs it would be great, for humans, however, its not ideal.
Boron 5mg – Boron is actually pretty good, but usually it’s better dosed at 10mg, it’s actually got a whole host of benefits beyond joint health. It’s a known fact that boron is essential for joint health in general.  Human trials however, generally suggest 6mg and up should be the minimal dosage, and in many cases 50% or more of the trial participants have reported favorable reduction in pain. This is a good inclusion for Kirkland Triple Action Joint Support.
Hyaluronic Acid 3.3mg – Whilst hyaluronic acid showed some promise, it doesn’t seem to be effective in humans when it’s ingested. And whilst it is particularly effective at reducing joint pain and improving mobility when it’s injected directly into the site of the joint pain, that same efficacy doesn’t translate to oral supplements.
When we compare Kirkland Triple Action against the competition it really doesn’t hold up, the formula is dated and comes from a time when supplements could get away with pretty much selling placebo’s with little to no benefit on joint health. Fortunately there are a lot of better options out there with doses that are in line with the clinical studies. And if you are sold on a collagen supplement you should still just go for a cheaper option, you may as well just go for a budget type II supplement for about $10 rather than spending $30 on Kirkland.
We generally recommend FlexAgain as a catch all as it covers the most effective supplements for joint health and joint pain relief.
1 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4729158/
2 - https://pubmed.ncbi.nlm.nih.gov/7889887/
3 - https://pubmed.ncbi.nlm.nih.gov/17658908
4 - https://pubmed.ncbi.nlm.nih.gov/7889887/