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Labradors are built to work, and their hips and elbows pay for it later. By eight or nine most Labs have some wear, and the breed carries a well-known risk of hip and elbow dysplasia on top of ordinary age-related arthritis. A good joint supplement won't turn the clock back, but it can keep an older Lab moving comfortably for longer.
The other half of the job with this breed is weight. Labs are famous for their appetite, and every extra kilo lands straight on those sore joints. Supplement and diet go together here.
A 30kg Labrador needs a lot more glucosamine than a spaniel to reach the levels used in trials. Under-dosing is the commonest mistake: someone gives a standard scoop meant for a medium dog and wonders why nothing changed. Match the dose to bodyweight, and for a senior with existing arthritis lean towards the high-strength versions.
Green-lipped mussel is the ingredient to prioritise for this breed. It brings omega-3s that calm joint inflammation as well as the building-block glucosamine, which matters when there's already damage rather than just wear to prevent.

The default for a reason. Strong green-lipped mussel dose and the widest trial record. Chews most dogs take as a treat.
Check Price on Amazon →Tablets declaring 334mg glucosamine and 150mg chondroitin each, plus MSM and collagen, at one large tablet per 10kg a day. The cheapest declared-dose option here at £14.99–£29.99. (Do not buy Mobile Bones for this job — it declares glucosamine at 1.4% of a powder — and Bionic Biotic is a gut supplement with no joint actives at all.)
Check Price on Amazon →Higher dose, aimed at dogs already stiff rather than early prevention. The one to reach for when the damage is done.
Check Price on Amazon →A vet-counter staple. Tightly dosed and easy to give over food.
Check Price on Amazon →If your Lab is carrying extra weight, losing it will do more for the joints than any supplement. Studies in overweight Labs show real improvement in lameness from weight loss alone. Use the supplement to support the joint, and the diet to unload it.

Given the breed's dysplasia risk, many vets suggest starting from around age five, or earlier for a working or very active Lab. For a senior already showing stiffness, start now and give it six weeks to judge.
For a big senior dog with existing stiffness, start with a high-strength option such as YuMOVE Joint Support PLUS Max or Riaflex Joint Plus, both dosed properly for the breed's size.
It can ease the arthritis that dysplasia causes, but it won't fix the joint itself. Dysplasia needs a proper vet assessment, and severe cases sometimes need surgery or ongoing pain relief.