CL Answers

I am very concerned about getting too much vitamin A. Is there danger in getting too much vitamin A if I take fish oil, which I've heard contains a lot of vitamin A, in addition to my multivitamin?

Find out if taking vitamin A along with fish oil can lead to an excess of vitamin A and how to avoid vitamin A overdose.

Can turmeric or curcumin with black pepper extract cause constipation? I had this problem, but it resolved when I switched to a curcumin supplement without piperine (black pepper extract).

Learn more about black pepper extract, why it is added to turmeric/curcumin supplements, and if it can cause gastrointestinal effects.

Is it safe to take CoQ10 while taking blood thinners like warfarin or Plavix (clopidogrel)?

Learn more about the possible counteractive effects of CoQ10 and blood thinners, including safety.

Is P-5-P really better than "regular" vitamin B6?

Learn more about pyridoxal-5-phosphate (P-5-P) and vitamin B6.

I started taking red yeast rice and soon after developed insomnia. Could my red yeast rice supplement be the problem?

Does red yeast rice make you tired and cause insomnia? ConsumerLab explores this question and other red yeast rice questions. Learn more at ConsumerLab.com.

Is there a difference between taking vitamin D in the dry form versus the oil capsules? Is one better than the other?

Learn more about how to take vitamin D, the best form to take and the best time of time day to take vitamin D.

My HDL (good) cholesterol level is low. Should I take niacin to raise my HDLs?

Learn more about niacin and find out if it can raise HDL ("good") cholesterol levels.

Are there supplements that can reduce prostate size?

How to reduce prostate size using supplements for benign prostatic hyperplasia (BPH), including beta-sitosterol and saw palmetto.

My doctor warned me that red yeast rice can cause liver damage - is that true?

Can red yeast rice cause liver damage? More information on its effects, including possible danger to the liver and kidneys.

I've read that the best form of vitamin E is d-alpha tocopheryl succinate (it's recommended in the paleo diet, for example), but I don't see that listed on product labels. How can I find it?

Learn more about the different names and types of vitamin E, including d-alpha tocopheryl succinate, natural and synthetic.