Keratin treatment without formayhde is it still bad. isn't keratin hair protein to make it stronger. i have been using for 2 years and noy losing hair?

Hair Conditioning: Normal hair only needs a deep conditioning once a month. A deep conditioner usually needs to be left on the hair for at least 5 minutes and some up to 20 minutes. Some require a shower cap to be placed over the hair while it is conditioning. Some deep conditioners contain anti-oxidants like cranberry oil which help repair damage caused by pollution. Cranberry oil contains vitamin e, omega-3, other.