Arnold Schwarzenegger Shares Top Creatine Risks to Look Out ForIn the newsletter, Schwarzenegger explained that while creatine has a better safety profile than most supplements, what’s in the tub is more important than what’s plastered on the label. He pointed out that banned substances and undeclared drugs have been found in creatine products, according to multiple studies. “And many creatine products don’t even have any creatine and instead are stuffed with other, sometimes illegal, performance-enhancing ingredients. Lastly, Schwarzenegger revealed that those who have existing kidney disease should hold off on taking creatine and consult with a doctor first. Looking at 25,000 adults, scientists found that taking creatine was associated with a significantly lower risk of developing cancers.