Top Biological Sciences subreddits

Largest Biological Sciences subreddits

Largest Biological Sciences subreddits

#	Subreddit	Members	12-mo growth	Commenters / mo
1	r/biology	5.48M	+0.6%	2,738
2	r/Naturewasmetal	983,476	+2.7%	959
3	r/Biohackers	918,734	+38%	15,963
4	r/Ornithology	424,055	+11%	1,430
5	r/Paleontology	332,459	+21%	2,432
6	r/Entomology	311,149	+14%	3,803
7	r/biotech	257,197	+27%	4,139
8	r/botany	210,884	+12%	562
9	M r/microbiology	202,837	+13%	796
10	r/neuroscience	187,114	+9.6%	119
11	r/Aging	177,929	+73%	10,887
12	r/evolution	175,281	+20%	1,646
13	r/BodyHackGuide	168,845	+323%	7,765
14	r/23andme	168,393	+11%	4,424
15	r/bioinformatics	166,954	+16%	888
16	r/zoology	153,300	+41%	3,394
17	r/MicroPorn	151,289	+1.3%	14
18	M r/marinebiology	148,696	+6.4%	339
19	N r/neuro	147,663	+13%	438
20	r/genetics	145,550	+10%	657
21	E r/ecology	125,554	+13%	662
22	r/microscopy	120,864	+13%	582
23	W r/whatisthisbone	89,369	+5.1%	551
24	P r/Parasitology	76,760	+9.9%	537
25	r/PrehistoricLife	65,390	+44%	587

Fastest growing Biological Sciences subreddits

Member growth over 12 months, among subreddits that had at least 18,251 members a year ago.

Fastest growing Biological Sciences subreddits

#	Subreddit	12-mo growth	Members gained	Members	Commenters / mo
1	r/BodyHackGuide	+323%	+128,903	168,845	7,765
2	r/AskBiology	+80%	+18,106	40,724	1,663
3	r/Aging	+73%	+74,840	177,929	10,887
4	Q r/QuantifiedSelf	+52%	+9,645	28,360	396
5	r/PrehistoricLife	+44%	+20,119	65,390	587
6	r/zoology	+41%	+44,796	153,300	3,394
7	r/pleistocene	+40%	+16,335	56,878	520
8	r/Biohackers	+38%	+253,494	918,734	15,963
9	r/Agarporn	+36%	+7,072	26,834	409
10	r/molecularbiology	+35%	+10,471	40,606	265
11	r/wildlifebiology	+32%	+9,817	40,394	348
12	r/biostatistics	+29%	+6,708	30,031	164
13	r/biotech	+27%	+54,134	257,197	4,139
14	r/Paleontology	+21%	+58,575	332,459	2,432
15	r/evolution	+20%	+28,984	175,281	1,646
16	N r/NIH	+17%	+5,802	39,135	1,083
17	r/biologymemes	+17%	+9,157	62,786	210
18	r/neurology	+17%	+9,274	65,088	528
19	r/DNA	+16%	+4,019	28,661	161
20	r/bioinformatics	+16%	+22,809	166,954	888
21	B r/biotechnology	+15%	+3,925	29,473	47
22	r/Entomology	+14%	+39,005	311,149	3,803
23	r/microscopy	+13%	+14,187	120,864	582
24	M r/microbiology	+13%	+23,653	202,837	796
25	E r/ecology	+13%	+14,425	125,554	662

Most members gained

Biological Sciences subreddits that gained the most members

#	Subreddit	Members gained	12-mo growth	Members	Commenters / mo
1	r/Biohackers	+253,494	+38%	918,734	15,963
2	r/BodyHackGuide	+128,903	+323%	168,845	7,765
3	r/Aging	+74,840	+73%	177,929	10,887
4	r/Paleontology	+58,575	+21%	332,459	2,432
5	r/biotech	+54,134	+27%	257,197	4,139
6	r/zoology	+44,796	+41%	153,300	3,394
7	r/Ornithology	+41,109	+11%	424,055	1,430
8	r/Entomology	+39,005	+14%	311,149	3,803
9	r/biology	+31,133	+0.6%	5.48M	2,738
10	r/evolution	+28,984	+20%	175,281	1,646
11	r/Naturewasmetal	+25,810	+2.7%	983,476	959
12	M r/microbiology	+23,653	+13%	202,837	796
13	r/botany	+23,212	+12%	210,884	562
14	r/bioinformatics	+22,809	+16%	166,954	888
15	r/PrehistoricLife	+20,119	+44%	65,390	587
16	r/AskBiology	+18,106	+80%	40,724	1,663
17	r/23andme	+17,182	+11%	168,393	4,424
18	N r/neuro	+16,532	+13%	147,663	438
19	r/neuroscience	+16,392	+9.6%	187,114	119
20	r/pleistocene	+16,335	+40%	56,878	520
21	E r/ecology	+14,425	+13%	125,554	662
22	r/microscopy	+14,187	+13%	120,864	582
23	r/genetics	+13,783	+10%	145,550	657
24	r/molecularbiology	+10,471	+35%	40,606	265
25	r/wildlifebiology	+9,817	+32%	40,394	348

Most active Biological Sciences subreddits

People who comment in a month, the average of the three months ending September 2026.

Most active Biological Sciences subreddits

#	Subreddit	Commenters / mo	Posts / mo	Members
1	r/Biohackers	15,963	2,224	918,734
2	r/Aging	10,887	634	177,929
3	r/BodyHackGuide	7,765	1,596	168,845
4	r/23andme	4,424	746	168,393
5	r/biotech	4,139	1,136	257,197
6	r/Entomology	3,803	1,843	311,149
7	r/zoology	3,394	260	153,300
8	N r/Nutraceuticalscience	3,287	853	31,057
9	r/biology	2,738	549	5.48M
10	r/Paleontology	2,432	672	332,459
11	r/AskBiology	1,663	284	40,724
12	r/evolution	1,646	184	175,281
13	r/Ornithology	1,430	398	424,055
14	r/DNAAncestry	1,324	530	17,790
15	r/DebateEvolution	1,304	135	21,133
16	N r/NIH	1,083	174	39,135
17	r/Naturewasmetal	959	149	983,476
18	r/bioinformatics	888	331	166,954
19	M r/microbiology	796	255	202,837
20	E r/ecology	662	151	125,554
21	r/genetics	657	181	145,550
22	r/PrehistoricLife	587	177	65,390
23	r/microscopy	582	450	120,864
24	r/botany	562	147	210,884
25	W r/whatisthisbone	551	399	89,369

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• All topics

How these lists are made

• Members are the member counts measured in October 2026.
• Activity (commenters and posts per month) is the average of the three months ending September 2026. Posts by known bots are not counted.
• 12-month growth compares members now with members a year earlier. A subreddit is ranked by growth only if it already had at least 18,251 members a year ago (the median for subreddits with a known growth), so brand-new communities don't top the list from a base of zero. Subreddits with more monthly active users than 0.808 per member, a sign of inflated activity, are left out of the growth and activity lists.
• NSFW communities are excluded: those Reddit marks as 18+, those where most posts are NSFW, and the Adult Content topic.
• Topics follow Reddit's own community categories.
• The lists are rebuilt every month. Each list shows the top 25 (100 for the largest subreddits overall). Download all lists as CSV (free to reuse under CC BY 4.0, with a link to this page).