Without subjecting you to a science lesson, both the G1 Overnight Boosting Peptide Hair Serum, £52, and Strength and Length Shampoo, $26, feature the ingredients baicapil, salicylic acid, and provitamin B5. The brand claims that they promote hair growth, exfoliate the scalp, and keep it moisturized respectively. The Strength and Length Conditioner, £26, also boasts baicapil and provitamin B5, with the addition of plant-based keratin, said to smooth frizz, repair damage and enhance shine. Intrigued — and still a little bit doubtful — I asked independent trichologists for their thoughts on the ingredients inside everything. Mainly, I wanted to know whether I really did have some genuinely game-changing hair growth products on my hands.