Table 1.

The treatment effect on the premature breakage (number of prematurely broken fibres per 50 tested fibres)

	Relaxed Hair DI Water	Relaxed Hair 1% Leucine	Relaxed Hair 1% Low‐MW Keratin Peptide	Relaxed Hair 1% Mid‐MW Keratin Peptide	Relaxed Hair 1% High‐MW Keratin Peptide	Virgin Hair DI Water	p Chi‐Squared Test
20% RH	15	19	15	6	5	12	0.005
80% RH	10	6	9	3	1	4	0.028