Both versions of GNC triflex contains glucosamine and chondroitin sulfate in 1500mg and 1200mg respectively.
Glucosamine 1500mg - Glucosamine has been shown in multiple studies to improve joint discomfort and mobility, however, it doesn't really seem to do much to help support healthy joint cartilage. It's a very good ingredient and is actually prescribed in many countries and 1500mg is the correct dose.
Chondroitin 1200mg - Only really of any use when paired with glucosamine, it's been shown to improve the efficacy of glucosamine, but not actually do anything by itself.
GNC Triflex Original Only
MSM 900mg - MSM has been shown to be effective at reducing joint pain and improve joint flexibility, the catch is, that the studies have shown you require 5grams or more, this means it typically isn't well suited to combined supplements as it would require 5 capsules just for the one ingredient.
Hyaluronic acid 5mg - The problem with hyaluronic acid in it's oral form is that it's broken down by stomach acid, if it's injected into the site it can be effective. There are a couple of studies which suggest 30mg could have some benefit, although there are more studies to the contrary than those that support it's use orally.
GNC TriFlex Fast Acting Only
Turmeric (95% curcuminoids) 105mg - curcumin is a particularly good ingredient, but 100mg simply isn't enough, 500mg is the bottom of the effective range, so whilst we like the ingredient, it won't have any benefit here.
Boswellia 100mg - This is actually the correct dosing, and aside from the glucosamine is the only ingredient in any of the the Triflex versions that will do anything to improve joint pain. Even still 100mg is the bottom end, but due to it's anti inflammatory effects is a decent inclusion for a supplement to support healthy joints.
MSM 50mg - this just isn't enough to do anything to support joint mobility or joint health. MSM needs to be dosed 100x higher than it is here, this is not going to have any benefit at all.