Coenzyme Q10 (CoQ10) is an antioxidant that your body produces naturally. However, levels can decrease with age, so some find it beneficial to take CoQ10 as a supplement. CoQ10 is used by the cells for growth and maintenance. Different brands claim to be more water-soluble than others. If you were taking it in pill form versus an injection, would it more beneficial to take the version that is more water or more fat soluble? How does a drug's solubility influence its effectiveness