Yep, Hollin is the reason I direct people towards The Ordinary with a bit more ease. I do get the trepidation of why something is so affordable, I'm always convinced something is coming at the cost of that, environment, slave labour, etc. I think if it were any other random company I'd be cautious too (SR skincare is similar in low prices, high actives but it remains a little unknown online company with reason as their products are not universally loved across the board) but I see The Ordinary as NIOD light, you get similar results but without the extra benefits from NIOD so dependant on your age bracket that will make a huge difference or not.
Maybe the Tata Harper Resufacing Mask is something for you yongnian. It's a BHA treatment mask that does the exfoliating bit but it then would be an incidental part of your routine and its far gentler than the PC acid but still highly effective, I really liked it (deluxe sample) but find it a bit pricey. Nautrismo will sell you a sample of it. Amazingy do a similar thing, you just tell them which five products from their site you'd like to try and for a set price €7.95 (?) it gets sent to you.
You can get pH strips from a chemist and Amazon though they're not very accurate. The digital ones cost a bit more, don't think that's worth the investment unless you go through a lot of different product.
I realise in the whole scaremongering ingredients category we never discussed SLS and phthalates.
Considering phthalates are being restricted by governments as a group (not just individual problematic ones) including the US where the chemical lobby is v. strong I do feel that that's an ingredient to avoid considering the links to various health issues, especially if pregnant and with young children. It goes beyond cosmetics, it's cleaning supplies, shampoos, etc. though very hard to eliminate out of your life completely.
I'm not a fan of SLS and even though I don't always agree with Paula Begoun I think she's right on the money with this one:
Versatile ingredient composed of several non-volatile alcohols. Functions primarily as a surfactant, but can also be used as a skin-conditioning agent, emulsifier, and solvent. Sodium lauryl sulfate (SLS) is one of the most sensitizing cleansing agents used in skincare products. In fact, it’s considered a standard comparison substance for measuring the skin sensitization of other ingredients. Thus, in scientific studies, when they want to establish whether or not an ingredient is problematic for skin, they compare its effect to the effect of SLS.
In amounts of 2% to 5%, sodium lauryl sulfate can cause sensitizing reactions for many people. Despite the sensitivity issue, it is not the same as the dire and erroneous warnings floating around the web about this ingredient.
Source
SLS is another one that's in a lot of things, if you have acne/spots around your chin and nowhere else it might just be down to the toothpaste with SLS in it. Irritated scalp? Ditto. Like PB mentioned it's not as evil as the internet would like you to believe but it's hardly pleasant and if you can afford to avoid it, I would.
On the pleasant side, it's not a topic I've ever delved into but with all the talk of rosacea and over-exfoliation Ceramides came to mind. These are naturally occurring in our skin but if it is severely compromised ceramides are your best friend for restoring it. The entire Cerave line is built around ceramides but the cheap and cheerful Superdrug Simply Pure Hydrating is also packed full of them. The Rosette Ceramide Gel or Lotion from Japan is also much loved.
I didn't forget about your SS question cockblocktopus, getting a seperate post as this has turned endlessly long again.