This invention relates to stable capsule formulations for pharmaceutical, nutraceuticals or food supplements which contain thymoquinone (THQ) as an active ingredient, and which can be stored at room temperature without significant loss of THQ during the shelf life of the capsules. The preferred capsules have a hydroxypropylmethylcellulose (HPMC) shell and may contain carvacrol as an additional active ingredient, either in synthetic form, or as part of a plant extract. Optionally, the capsules may contain a viscosity agent.
