
Less Hair Strands

Redheads have fewer hair than brunettes or blondes. According to research on an average, brunettes have 140,000 strands of hair; blondes have 110,000 strands of hair and redheads have 90,000 which is too less, but red hair is thicker than any other hair color.
Larger Dose of Anesthesia

In surgeries, it’s been recommended that a few redheads require 20 percent larger doses of anesthesia as compared to a regular patient. Research proved this that redhead needs more anesthesia than people having other hair colors.
Absorption and Making of Vitamin D

They are more efficient at making Vitamin D. Redheads have the low amount of eumelanin in their body that is why they cannot absorb the required level of Vitamin D. In any case, they compensate for this by creating their particular Vitamin D when they are present in low-light condition.
So, they do not need as much sunlight to get what they need.
Concept of Christmas Communities

Christian communities considered a mark of the devil were birthmarks, patches and the major one was red hair. Many Christian communities believed that Judas was a redheaded textual proof from the Bible.
This belief really inspired some painters to paint Judas with red hair.
Aristotle Theory

Aristotle had some issues with redheads. Aristotle himself reported for the once saying “The reddish are of bad character” which shows that he hates redheads.
Resistant to Pain Blocker

Redheads are more resistant to pain blocker. Redhead gene releases a chemical called pheomelanin, which is the cause of blocks the brain’s receptivity/acceptance to pain.