Biotin does not cause hair to thicken. Your hair just feels softer, but it doesn't naturally thicken. If you take too much, you will vomit. Taking too much can increase chances of strokes.
What Will Happen If I Take Too Much Biotin? Is Biotin Really A Vitamin That Cause Hair To Thicken
There is no known side effects long term or short. So don't believe the last comment.
Just stick to the reccomended amount of about 5mg.
Just stick to the reccomended amount of about 5mg.
Check with your doctor, I took biotin for months, it did nothing for me.
It is a water-soluble vitamin, so you can't overdose on it.