I like the ending — it makes the reply feel like it came from the formulator rather than customer service. I’d clean the grammar but keep that slightly playful voice:
Thank you for noticing the formulation. We love when someone reads our ingredient list this closely! The hydrolysed pea peptide helps condition and support the hair, while Pro-Vitamin B5 helps with softness and moisture.
With actives like these, we formulate around their effective dosage. They can also come in different forms and concentrations within the raw material itself, so where an ingredient appears on the INCI list doesn’t always tell the full story of how much active material is actually being delivered. Your point about pea peptide is a good example, and very much appreciated from someone who clearly pays attention to formulation. And because it’s such an interesting ingredient, we couldn’t help ourselves, we’ve been researching what else we can do with hydrolysed pea protein. Stay tuned :p