Pumpkin Seed Oil

Some limited evidence (with men only) that it blocks DHT (400mg dose).

https://hairgp.co.uk/pumpkin-seed-oil-for-hair-loss-evidence-vs-hype/

Cho YH, Lee SY, Jeong DW, Choi EJ, Kim YJ, Lee JG, Yi YH, Cha HS. Effect of pumpkin seed oil on hair growth in men with androgenetic alopecia: a randomized, double-blind, placebo-controlled trial. Evid Based Complement Alternat Med. 2014;2014:549721. doi: 10.1155/2014/549721. Epub 2014 Apr 23. PMID: 24864154; PMCID: PMC4017725.