 
Finger nails grow from a root which is buried underneath the skin of your finger, behind the visible nail. The visible nail does not grow, it is dead. To affect the growth of the nail you have to affect the hidden root.
Is it possible that elements of the garlic can penetrate the skin and affect the root. Yes. I can think of a much more likely explanation for your friends experience.

They didn't just put it in the nail, but the upper finger.
Rubbed in/massaged for 10-15 minutes.
Wouldn't say it is a miracle worker, but I def can say there were improvements.
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