If you consistently drink more alcohol than these recommended amounts though, it can lead to deficiencies or poor absorption of vital nutrients, and therefore affect your hair.
Iron for example can be lost during excessive drinking, which has been shown to promote healthy hair according to certain studies.1
Meanwhile, your ability to take in protein can be affected by drinking too much alcohol. A protein deficiency can lead to a number of problems for other parts of your body such as your nails as well as your hair too.2
The levels of zinc that you’re able to take in could be negatively impacted by excessive drinking on a regular basis. Some studies have shown that a lack of zinc could be part of the cause behind male as well as female pattern baldness.3