About r/HaircareScience
Community guide
r/HaircareScience (#999, about 1.1 million) is a science-focused hair-care room: the rules say to source your facts, that this is not medical advice, and that it is not a product-review, coloring, styling or DIY subreddit.
What belongs
Text discussion (about 4 posts/day). Rules require sourced claims, respect and no advertising; advice requests belong in the weekly advice thread. They also bar hair-loss or balding advice requests, product reviews or recommendations, coloring or styling help, DIY projects, water-quality advice, and treating the room as your doctor.
Versus product-review and styling rooms
Broader beauty or product-haul rooms optimize for recommendations. This one wants scientific discussion of hair and scalp, with reviews and how-to styling sent elsewhere.
Practical pointers
Cite sources; put personal “what should I buy?” questions in the weekly thread rather than a new post.
Since Nov 2, 2026, it has gained 0 subscribers (+0.00%). Among the 20 communities on our science list it is number 8 by size. It sits just behind r/pitbulls (#998) and ahead of r/WeWantPlates (#1000) in our ranking.
What sets r/HaircareScience apart
r/HaircareScience is far more text-driven than most big subreddits: 100% of its recent posts are text posts, against a median of 35% across the Top 100. r/HaircareScience is more of a browsing community than a debating one: 3.9 comments per post on average, well under the Top 100 median of 13.0. Growth has more or less levelled off (0.00% since Oct 29, 2026), which is common for very mature communities.
Subscriber growth
Between Oct 29, 2026 and Nov 9, 2026, r/HaircareScience stayed flat from 1,058,132 to 1,058,132 subscribers. The chart shows 3 weekly subscriber counts.
All-time top posts
The highest-ranked posts in the history of r/HaircareScience, from 2019 to 2024, ranked by Reddit.
- UPDATE: I posted a few days ago for help with my matted depression hair. Today I took the time to work through it.Jul 23, 2023 · gallery
- Warning ⚠️ About BiotinNov 23, 2020 · text post
- Bleached hair with hairspray and split ends vs healthy hair under microscopeu/krakma · Dec 12, 2024 · gallery
- Does anybody else see those NoPoo posts and think they’re insane?u/angelseggsaga · Dec 30, 2024 · text post
- Any insight on why my hair looks like this no matter what?u/No-Professional-8808 · Oct 1, 2023 · gallery
- Can someone explain the science behind why this shampoo works on my hair so well?u/LordRevanofDarkness · Aug 13, 2023 · gallery
- Please Be Wary of MonatDec 10, 2020 · text post
- I wish when searching the solution for hair problems the first results would be the scientifically proven methods not the freaking OILSu/prufanya · Jan 23, 2021 · text post
- What do I do about my sides? I want to grow my hair out but these frizzy sides don't go with the flow and stands right out, it doesn't help with products either? Do I cut it a little bit or should I …u/el_sunk · Aug 24, 2020 · gallery
- My Hair Under A Microscopeu/Character-East4913 · Oct 6, 2023 · gallery
What r/HaircareScience talks about
Across 25 recent posts (Oct 29–Nov 4), the words that come up most are “hair”, “products”, “wash”, “shampoo” and “color”. Other frequent themes are change, scalp, curl and treatment. By format, 100% are text posts.
Popular post flairs: Question (21), Discussion (4).
Activity and best time to post
r/HaircareScience gets about 4.1 new posts a day. The public archive holds 116,899 posts and 453,738 comments in total, about 3.9 comments per post. Last week the busiest day was Sunday (6 posts) and the quietest was Monday (2). Posting peaks around 09:00 UTC and is lowest around 02:00 UTC.
Rules of r/HaircareScience
The moderators of r/HaircareScience list 12 rules. In short:
- Source Your Facts
- We Are Not Your Doctor
- Post Advice Requests in the Weekly Advice Thread
- No Repetitive Posts
- This is a Science Subreddit
- No Advertising
- Be Respectful
- No Asking for Advice on Hairloss or Balding
- This is Not a Product Review or Recommendation Sub
- This is Not a Hair Coloring or Styling Sub
How to join
Open reddit.com/r/HaircareScience and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many subscribers does r/HaircareScience have?
r/HaircareScience has 1,058,132 subscribers (Nov 9, 2026), which makes it the #999 safe-for-work subreddit in the SubMouse ranking.
Is r/HaircareScience still active?
Yes. r/HaircareScience gets about 4.1 new posts a day (average of the last four weeks). Over its lifetime the archive counts 116,899 posts and 453,738 comments.
What is the best time to post in r/HaircareScience?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Sunday and the quietest Monday, and most posts arrive around 09:00 UTC, with the fewest around 02:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What kind of posts are on r/HaircareScience?
r/HaircareScience is a large Reddit community. Recent post titles often mention hair, products, wash, shampoo and color. Most posts are text posts (100%).
Is r/HaircareScience SFW?
Yes. Reddit does not mark r/HaircareScience as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
What are the rules of r/HaircareScience?
Join the community on Reddit first, then use “Create post”. r/HaircareScience accepts both text and link posts. It has 12 posted rules, starting with: “Source Your Facts”; “We Are Not Your Doctor”; “Post Advice Requests in the Weekly Advice Thread”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
What subreddits are similar to r/HaircareScience?
Communities with similar topics include r/psychology (4.9M), r/science (34.6M), r/askscience (26.4M), r/compsci (4M) and r/KerbalSpaceProgram (1.5M).
Stats from public data (data updated Nov 9, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026; top posts from Reddit’s public feeds). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/HaircareScience.