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Medications

• Medications often can cause gray hair to turn yellow. The chemical substances in medications may cause this yellowing effect.
  
  

Age-Related Causes

• According to Drweil.com, Dr. Andrew Weil says that age-related pigment changes can be a reason for the color change.
  
  

Mineral Deposits

• Mineral deposits from swimming pools and hard water may also cause gray hair to turn yellow. People who have water softeners in their homes may have less yellowing of their gray hair.
  
  

Smoking

• Just as it can cause yellowing of the nails, smoking can also turn your gray hair yellow. Smoking is not only bad for your health, but it is bad for your gray hair, as well.
  
  

Getting Rid of Yellow Hair

• Many deep-cleansing or chelating shampoos are designed to help get rid of yellowing in the hair. Blue- or violet-based shampoos or rinses can also neutralize yellow tones in gray hair.