The brand I use is:
Pearson and Shaw's Inner Shampoo
sold by
www.lifeservices.com
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At times, though, I've run out and just gone to GNC and bought a pure bottle of Polysorbate 80. It is very cheap at GNC... about $5 for a bottle.
I personally think Inner Shampoo is superior to plain Polysorbate 80. It is designed to be a full conditioning shampoo.
It takes a little getting used to to adject to any Polysorbate 80 based shampoo because the good and effect ones are non-foaming. With non-foaming shampoos you have to get used to applying something that feels a bit like sticky molasses and then combing it through your hair.
It says on the instructions "best applied to a dry scalp" and massaged in for a minute or two. The Inner Shampoo doesn't have a spout top that lets you do this. The GNC pure Polysorbate 80 does... but good enough the GNC top can be taken off the bottle and put on the Inner Shampoo bottle. It fits perfectly. I bought a GNC bottle and use it on all of my Inner Shampoo bottles.
Using Polysorbate 80 can also flip you out initially. As it takes the sebum and DHT away from the folicle... lots of dead hair comes out... so it looks like you are using more hair. This is an illusion. The only hair coming out is already dead. You are just losing it all at once.
Polysorbate 80 shampoos are also a life time thing. It took me 9 months before I realized it was helping. You aren't going to see results in a week or two.
Cool part is that you do see your hairline come back. I juice heavy on test. I have more hair on my temples at 43 than I did at 27.