I've never found any nail protein treatment to even come close to Nailtiques No. 2 Formula. It was pure wizardry. But their factory burned down a few years ago, stopping all production - resulting in bottles going for crazy prices on eBay.
I got into a bidding war during the first lockdown and ended up parting with £45 for a 15ml bottle but you know, nails
Just checked eBay and there's loads of stock back on there all going for the normal price. They must have a new factory, thank God.
You're welcome x