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"Mr. Monnin, a 44-year-old businessman from Paris, left the port of Havre for San Francisco for business reasons.
He had completely lost his hair.
A doctor on board the Louisiana, a passenger like him, encouraged him to wash himself in cold sea water and rub his head.
Mr. Monnin, eager to see his hair regrowth, followed the doctor's advice to the letter: he had a regular shower twice a day and also rubbed his head, morning and afternoon, with sea water.
The success was complete: upon his arrival in San Francisco his head was covered by abundant hair.
The journey had lasted five months.
This case was told to me by Captain Liger himself, who commanded the ship La Lousiana, which took Mr. Monnin from Havre to San Francisco. "
(Original text in French in L.H. Goizet's book, "La cure marine loin du litoral", 1871. It can be consulted at the National Library of France by clicking on the previous link).
Obviously, if we put sea water on our heads to recover or improve hair, it is also advisable not to use creams, shampoos, dyes or lotions that could harm it. (It is also advisable to avoid other toxins: drugs, sugar, tobacco, ...)
The reported case had not only received the effect of sea water on the skin, but also breathed sea breeze throughout the trip, and the cooks almost certainly used sea water to prepare the food (saving salt and fresh water). (You can't always cook using undiluted sea water. The book "Drinking Sea Water," explains how to cook different dishes with it.)
In addition to this case, the following photographs are from cases treated by Quinton with sea water injections and cited in this article on the book "El plasma de Quinton" (in Spanish).
The women who lose their hair because of chemotherapy can recover it quickly as is explained here and in chapter 13 of the book "Drinking Sea Water" which relates the rapid and complete recovery of a woman who had had cancer and had been treated with chemotherapy and hormonal treatment.