There’s some good ingredients in ProJoint Plus, and had it been a budget supplement we’d have rated it quite highly. Unfortunately, at $30 a bottle you’re starting to get into the mid range territory and it quickly becomes very average.
It’s got a good dose of Glucosamine sulfate, well within the effective range and the same goes for Boswellia. Both of these ingredients are well tested for improving joint pain  and reducing inflammation respectively . And chondroitin is OK, although it’s a little less than we’d like in an ideal world. It’s not the most important ingredient though as it only really serves to increase the efficacy of Glucosamine.
The downside is, everything else in the supplement. All of the other ingredients are so incredibly underdosed that they won’t have any function at all. And a lot of these ingredients are good, curcumin for example (the active compound in turmeric) has been shown to be incredibly effective in human trials. The problem is that you need 500mg of curcumin  which only makes up about 10% of turmeric and the turmeric in ProJoint plus only totals 150mg.
This is quite common with mid-range joint supplements like Projoint Plus. If we compare it against some of the Osteo Bi Flex range it’s a very similar product, edging out some of the formulations by having a slightly more ideal dose of Boswellia, but equally losing out on not containing vitamins.
And if we compare it to products that cost about $15 a month more, then you’re getting nowhere near as much for your money as the slightly more expensive bracket tends to contain 3-5 times the active ingredients including the correct doses of things like curcumin and bromelain which Projoint Plus uses to make it’s health claims.
All in all, we’d say that if you can afford the extra $15 you’re better off getting something like FlexAgain (which we rate as the best joint supplement on the market right now) as it contains the correct doses of 11 clinically proven ingredients.
However, if $30 a month is your absolute limit then there are worse options that ProJoint Plus. But, you’d probably be just as well off with a store brand glucosamine sulfate supplement and some Omega 3.
|● Correct Dose Of Glucosamine||● All But Two Of The Ingredients Are Underdosed|
|● Available On Amazon|
|● Correct Dose of Boswellia|
1500 mg of Glucosamine Sulfate – This is a good dose of glucosamine as we mentioned in the introduction and a solid start for ProJoint Plus. The fact is that this is the backbone of a lot of mid range supplements. It’s mostly been trialed for knee pain in osteoarthritis specifically.  The natural compound found in cartilage has even been prescribed in many countries, and is generally well tolerated. Most studies suggest that it helps reduce joint pain, but doesn’t really do much for mobility of joint health in general.
200 mg of Boswellia Serrata Extract – Boswellia is mostly used as an anti inflammatory and most clinical trials show it to be at least moderately effective, again it’s a common ingredient for mid range joint supplements and 200mg is the clinically studied dose. 
150 mg of Chondroitin Sulfate – Chondroitin is a little bit more mixed, with most positive studies showing that it does increase the efficacy of Glucosamine Sulfate.  However, it doesn’t really do anything by itself and is normally dosed a bit higher than it is in ProJoint Plus.
150 mg of Turmeric – Curcumin, the extract from Turmeric that works as an anti inflammatory is great as a joint health supplement ingredient. [3,6] Unfortunately, you need way more of it than is in here. Realistically more than 30x the amount in Projoint Plus.
25 mg of Quercetin – Quercetin is an interesting choice, the studies are mixed although leaning slightly to the positive in terms of reducing joint pain and inflammation.  The problem we have here is that functional doses are 250-1000mg meaning that the amount in Projoint plus isn’t going to do anything.
25 mg of Methionine – The standard dose of methionine is 200mg four times a day. So, once again we’re not even close to the effective range.  Methionine is an anti oxidant meaning that it can have some benefits for joint health, but not at this dose.
25 mg of MSM (Methylsulfonylmethane) – A lot of joint supplements contain MSM, and even some of the good ones fall prey to having to throw it in for marketing purposes. The fact is that you need grams of this for it to be effective, not 25mg. 
25 mg of Bromelain – Bromelain is an enzyme found in pineapples. Interestingly the way it works is by stopping your body from producing inflammatory compounds. It binds to the precursors meaning that they can’t actually be turned into prostaglandins which cause inflammation. Instead it creates cytokines which have the opposite effect. The problem is that you need 100mg or more for it to do anything. 
1 - https://www.nccih.nih.gov/health/glucosamine-and-chondroitin-for-osteoarthritis
2 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3309643/
3 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664031/
4 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6097075/
5 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6035477/
6 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664031/
7 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4808895/
8 - https://pubmed.ncbi.nlm.nih.gov/28929442/
9 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5372953/
10 - https://www.nccih.nih.gov/health/bromelain