The nail-care spray category is crowded, and a lot of listings lean on vague or exaggerated claims. Here's what's worth checking before you buy any product in this category, KlaroNail included. See the KlaroNail main page for a full product overview.
A cosmetic works on appearance and comfort. A drug has to prove it treats a specific condition before it's legally sold. Be wary of a "cosmetic" spray marketed with drug-like disease claims — that's a mismatch worth questioning.
Look for a full, named ingredient list rather than a vague "proprietary blend." A named list, even without every amount quantified, is more transparent than a blend that discloses neither.
Active ingredients like undecylenic acid work by concentration. If a product claims an "active" ingredient with zero printed amount anywhere, that's a gap worth asking about before you buy.
A guarantee that states a real day count, what it covers (opened bottles or not), and who pays return postage is more trustworthy than a vague "satisfaction guaranteed."
Nails grow slowly. Any product promising a dramatic change within days, rather than weeks or months, is overselling what a topical spray can do.