One of the forms of vitamin C in supplements is Ester-C. In addition to being non-acidic, a recent study suggests another possible benefit over regular vitamin C (ascorbic acid). Get more information about this and other forms of vitamin C in the "ConsumerTips" section of the Vitamin C Supplements Review >>

It is well known that taking a red yeast rice supplement can cause large reductions in LDL "bad" cholesterol and that sterol or stanol esters can lead to modest reductions. But does combining them result in greater benefits than using either alone? A new study says no. It's unclear, however, whether this is always the case. Get details in the updated Red Yeast Rice Supplements Review >>. Also see the updated, Cholesterol Lowering Supplements Review >>

Which form of fish oil is best absorbed? Find out what two recent studies showed in comparing triglyceride, ethyl ester, and monoacylglyceride forms of fish oil in the Forms of Fish Oil section of Fish Oil Supplements Review. Also see our Top Picks for fish oil.

Spoiled fish oil does not lower LDL "bad" cholesterol, while the same amount of non-spoiled fish oil does, according to a new study. If you take fish oil to improve your cholesterol levels, it would seem best to use a product that is not spoiled — something ConsumerLab tests for. (It may also be best to choose an oil in the triglyceride form, rather than the ethyl ester form). For details, see the "Quality Concerns" section of the Fish Oil Supplements Review. Also see our Top Picks among fish oils.