Is it hydrolysed protein? If not it is likely useless. Protein overload affects different people in different ways: changes in curl or wave pattern, a 'dry' or rough feeling even when wet, wet frizz, dry frizz, tangling .... There is no one size fits all frequency and it can often vary seasonally/ with the dew point.
Do be aware shampoo and conditioner ingredients can combine to cause a compound that builds up, CWC is a risk for this.
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