Hot Rub Pain Oil works by heat friction through massage,to allow body to absorb oils which work to reduce pain and inflammation.

Capsaicin (from Chilli Oil) works by reducing Substance P, a pain transmitter in your nerves.
Mustard oil is rich in alpha-linolenic acid (ALA), a type of omega-3 fatty acid that may help decrease inflammation and relieve pain caused by conditions like rheumatoid arthritis. Omega-3 fatty acid helps to ease stiffness and pain.
Camphor oil increases your blood circulation and helps in relieving stress and irritation on your joints.
Eucalyptus oil with its antibacterial, moisturizing, and anti-inflammatory properties, works by bringing a cold or warm sensation that distracts from the pain.
Mint Oil, because it contains menthol. is highly effective for reducing joint pain and inflammation.