Since amino acids are the building blocks of protein, it always confused me that most "hair and nail" supplements are just biotin.... No silica, and no aminos. I took biotin for a very long time and I didn't see a difference when my hair was straight. It's always been brittle and snaps if you pull it so I'm deficient in either protein on the hair shaft or moisture. Since dreading, I don't have to do masks anymore though thank goodness. Would you say you're probably missing out on some nutrients? Once, I had a hairstylist tell me that taking a multi boosts the effectiveness of biotin, is there any truth to her statement?