In the news today - bbc.co.uk/news/health-24473156 - a New Zealand research team conducted a meta-analysis of 23 trials examining the effects of vitamin D supplementation on bone mineral density in healthy adults. The study, published in the journal The Lancet Diabetes & Endocrinology found they had no beneficial effect on bone density, a sign of osteoporosis.
So is it time to stop popping those supplement pills? IF you're a healthy adult?
To get to grips with what a meta-analysis is and what it means check out our Sense About Systematic Reviews: