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Buying spec
This produces a specification, not a product. Nothing on this site has tested a brand, and a recommendation that has not tested anything is just an advert with a hedge on it. What a fixed set of rules can do is tell you which base makes sense for what you are pairing it with, which ingredients to rule out, and which numbers to look for on the product page — which is enough to walk into a shop or a search box and judge for yourself.
A specification, not a product. No brands, no affiliate picks dressed as advice.
Every base verdict comes from the compatibility engine; every ingredient from the ingredient engine.
Nothing you select leaves your browser. No account, no record.
Your spec appears here
Pick whatever applies on the left — even one answer produces something usable. The more you select, the more bases get ruled out for a stated material reason rather than a preference.
Educational information about product categories and ingredient categories only — not medical advice, not a product-safety verification, and not a claim that any formula is safe for your body. An ingredient list shows what is in a formula, never how much. A product's own label and instructions always take priority. Stop using anything that causes irritation, and seek care for pain, bleeding, or an allergic reaction rather than changing product.
Almost every “best lubricant” list you will find is ranked by commission rate and written by someone who has tested nothing. This site has tested nothing either — the difference is that it says so, and gives you the criteria instead of the conclusion. A spec you can apply yourself outlives any list, survives reformulations, and cannot be bought.
One consequence worth stating plainly: if a brand will not publish an osmolality figure or a pH, that is information. The manufacturers who measure it tend to say so.