I think it's important that anyone reading this knows that this is a very unusual situation, most people who co wash have no issues at all, and the op has not yet identified what it is about co washing that is causing this problem. It could therefore be something as simple as an ingredient in the product being used, rather than the fault of the process.
Of course, anyone changing any part of their routine should be aware and keep an eye on changes to their hair, but please don't let this put you off trying something that has such good effects for most.
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2C, Medium thickness, Low posity
Recovering from a year of keratin and bleach with CG
Low Poo, Condition, Leave in, Curl cream, Supersoak, Gel, Diffuse on high heat, with minimal lift to encourage waves and reduce frizz, Dry on cool with nozzle down to smooth hair and finish drying,Shine Serum
Weekly gelatin protien treatments.