Castiva Arthritis Pain Relief Lotion is available in both warming and cooling formulas, depending on whether you have persistent or periodic arthritis pain. Simply choose the formula that is right for you and enjoy fast relief. Both formulations of Castiva Arthritis Pain Relief Lotion have a natural castor oil base. This allows the capsaicin in the warming formula and the menthol and methyl salicylate in the cooling formula to penetrate the skin fully to deliver their soothing agents. No matter which formula you choose, this means fast relief from arthritis pain. Castiva takes great care to choose only the best castor seeds and to use a double filtration process to capture the oil and ensure you get the best product possible. The result is a high quality, odorless base for its pain relief lotion.