There is evidence titanium may be the cause of the rare disease yellow nail syndrome: https://en.wikipedia.org/wiki/Yellow_nail_syndrome https://en.wikipedia.or

There is evidence titanium may be the cause of the rare disease yellow nail syndrome: https://en.wikipedia.org/wiki/Yellow_nail_syndrome https://en.wikipedia.org/wiki/Yellow_nail_syndrome study ref: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3176400/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3176400/