Here three quotes from Andreas Moritz
that may answer your question:
do these flushes help hair loss?
If you are referring to Liver Flushes
and colon cleansing, yes, they help prevent waste and toxins entering the hair follicles, and they also improve circulation to and lymph drainage from the head area, all important factors for proper hair growth.
Hair health reflects how well the intestines function. When digestion of food and proper elimination of waste improve, hair growth improves as well, along with other areas of the body such as the skin.
When people go off a non-nutritious diet and live a more healthy lifestyle, the body goes from the mode of accumulating toxins and waste to the mode of eliminating toxins and waste. As the body is trying to rid itself of the toxins, the pathways of elimination can easily get clogged up. If protein foods such as meat, fish, cheese, etc. were part of the diet, the body may also throw out a lot of the excessive proteins stored in the blood vessel walls. Hair is basically a protein waste product of the body, and so are the nails. If too much of all of this travels to the hair follicles, they may suffocate and the hair falls out. When making such changes in your life, make sure to keep the colon, kidneys and liver bile ducts as clean as possible, in order to prevent the body from using other routes of elimination such as the skin and hair.
In addition, when detoxifying strongly (versus accumulating toxins) the body has to give up more minerals than is usual, especially sulphur, the primary mineral for detoxification. This can affect hair health. Many plant foods, especially green leafy vegetables contain sulfur and are very helpful. Also broccoli, cauliflower, cabbage, legumes and sunflower seeds contain sulphur.
If not enough, MSM is a great good source of it. There are studies to show signifant improvement in hair growth and nails among people using MSM, in fact, in 80% of the subjects compared with the placebo group. When starting on MSM, though it is important to start slowly at a the lowest dosage and then gradually build up every few days to 3,000-5,000 milligrams ,otherwise there will be unpleasant side-effects (not that MSM has anything in it to harm the body, but making adjustments too fast can upset the body). Follow directions on product bottles.