About this tool
The ingredient checker reads the INCI list off the back of any product and flags three things that matter most for hormonal and sensitive skin: ingredients to avoid in pregnancy, ingredients that commonly clog pores, and ingredients that frequently irritate the skin barrier. It runs entirely in your browser — nothing you paste is uploaded or stored.
How the ingredient checker works
Copy the ingredient list from a product page or the back of the bottle and paste it in. The tool splits the list on commas, semicolons and new lines, then matches each ingredient against curated watch-lists for pregnancy safety, comedogenic (pore-clogging) oils, and known irritants. Matching is done on whole ingredient names so common fatty alcohols and plant extracts are not mistaken for harsh alcohols.
You get a per-ingredient breakdown with a plain-English reason for every flag, plus an all-clear when nothing on your list raises a concern. Because the check is heuristic and ingredient tolerance is personal, treat it as a fast first screen rather than a medical verdict.
Why ingredient screening matters
Skin tolerance shifts across the menstrual cycle, in pregnancy, and through perimenopause. Retinoids and high-strength salicylic acid are usually avoided in pregnancy; fragrance and denatured alcohol are among the most common triggers for reactive skin; and a handful of oils and waxes are frequently linked to breakouts on acne-prone skin. Knowing which of these is in a product before you buy saves money and prevents flare-ups.
Reading an INCI list by hand is slow because ingredients hide behind unfamiliar Latin and chemical names. The checker does the cross-referencing for you in a couple of seconds.
How to use a flag responsibly
A flag is a prompt to investigate, not a declaration that a whole product is bad. Concentration, formulation, contact time, and your own history all affect whether an ingredient is appropriate. An ingredient near the end of a rinse-off cleanser behaves differently from the same ingredient near the top of a leave-on serum. When a concern appears, check the product directions and ask a qualified professional if pregnancy, allergy, eczema, or another medical condition is involved.
Patch testing is still useful even when a list receives an all-clear. Apply a small amount to a discreet area and wait before using it broadly, especially with a new active. Introduce one product at a time so you can identify the cause if irritation or breakouts develop. Keep the product packaging because formulas can change while a retailer page still shows an older list.
