from ChatGPT:
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Saline solution is commonly used in hair transplant surgery to keep the hair grafts hydrated during the procedure. Saline solution is a sterile, isotonic solution of sodium chloride (salt) in water, and it is not known to harm hair grafts when used properly.
In fact, saline solution can be beneficial for hair grafts because it helps to maintain their moisture and prevent dehydration. Dehydrated grafts can be damaged or die, so it is important to keep them hydrated throughout the transplant process.
However, it is important to note that the concentration and pH of the saline solution can affect the viability of hair grafts. Using a saline solution that is too acidic or too alkaline can be harmful to hair grafts, and can lead to their death. Therefore, it is important to use a saline solution that is properly balanced and within the appropriate range of pH.
Overall, if used properly, saline solution should not harm hair grafts and can actually help to ensure their survival during the transplant process."