Buying Dr Voss comes down to a few checks you can do from the product page. Everything else is preference. Match the weight to your hair, not the marketing on the front. Anything with heavy silicones needs a clarifying wash every few weeks. The groups below run from the decision that matters most to the ones you make afterwards.

What decides this is hair type, formula weight and build-up. Everything else is preference. Two from the first group show the range: Manymoons's For Oily Hair Solid Shampoo Bar at $26, and maccosmetics.com's Lash Dry Shampoo Mascara Refresher - Refreshing Black at $24. The first is the considered buy; the second is the one to start with. Anything with heavy silicones needs a clarifying wash every few weeks. Match the weight to your hair, not the marketing on the front. A higher price mostly buys materials and finishing, and occasionally it buys nothing at all.

Less product, applied lower down, almost always looks better. From the second group, Manymoons's For Dry Hair Solid Shampoo Bar ($25) is the one that earns its place, because it works in more than one context without being restyled. The third group is smaller and deliberately narrower, hair products, for the decisions you make after the main one. None of this needs the whole group. One piece from each is usually enough.

There are 20 hair products here from 8 brands, $9 to $59, all in stock when this was written. We would not buy all of them, and neither should you. e.l.f. Cosmetics's Never Thirsty Moisturizing Conditioner at $9 is the low-risk way in, and Oribe's Gold Lust Nourishing Hair Oil at $59 only makes sense if this is a category you already use constantly. Read as a set, they get you close to Dr Voss without any single purchase being compulsory. Nothing here is included because it is famous, and price is not used as a proxy for quality anywhere on this page. If you take one thing away: buy the one you can picture using this week, not the one you are saving for later.