Taken by millions of Brits and Americans in the pursuit of achieving optimum health, vitamins and supplements are a multi-billion-pound industry.
However, experts warn taking certain combinations of them can be dangerous.
Potential harms of mixing popular vitamin pills range from deficiencies to even organ damage.
The riskiest pairing comes with taking red yeast rice extract and niacin — said to help lower cholesterol.
Todd Sontag, a family medicine specialist with Orlando Health Physician Associates in Florida warned that both products together could potentially cause liver damage.
What's more, Mr Sontag explained, the supposed benefits to heart health of taking the supplements is not rooted in good evidence.
'Doubling up doesn't increase the benefits and may be harmful to the liver,' he told wellness website The Healthy.
This risk is heightened if other cholesterol-lowering substances, like statins, are added into the mix.
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