How We Rank and Verify Heat

• Guinness record: Certified by Guinness World Records from university lab tests.
• Lab tested: Measured by a university, government or peer-reviewed lab.
• Breeder claim: Number published by a breeder or seller; no independent lab named.
• Unverified: Claimed in the media; no lab, method or report published.

Only Guinness-certified and lab-tested peppers appear in the main ranking. Others are listed separately as claims.

• SHU from HPLC: labs measure capsaicinoids in dried, ground fruit (ppm) and multiply by about 15-16. NMSU used x16 (Bosland & Baral 2007). Values derived here from Spices Board or journal capsaicin percentages use x16 and capsaicin only, so they somewhat understate total capsaicinoids. They are on a dry-weight basis.
• Heat varies with genetics and growing environment. Stressed plants run hotter (NMSU Guide H-237; NMSU 2012 found individual plants of one variety ranging up to about 2x the mean). A single number is only a guide.
• Guinness record wording: the rules page says the record 'is based on the heat of a single chilli pepper grown', yet the Reaper and Pepper X entries report averages. Neither entry publishes sample size or spread. Wikipedia also notes an unverified claim that a Winthrop FOIA response shows 'major deviations from Guinness rules' for the Reaper. I could not see the documents, so this is not used.
• Pepper X: Guinness dates the record to tests 'on 23 August 2023', but the Guinness news story says Winthrop tested specimens from the past four years. Dates also differ for the record (23 Aug 2023) and the announcement (9/16-17 Oct 2023). No independent test has been published.
• Carolina Reaper: Guinness's 2023 Pepper X page says the Reaper 'delivered an average of 1,569,300 SHU', but Guinness's own 2017 record says 1,641,183. Both were Winthrop averages from different years. Parentage conflicts: Guinness 2013 says Sweet Habanero x Naga Viper, while Currie in other interviews says La Soufriere habanero x Pakistani Naga.
• Trinidad Moruga Scorpion: the much-quoted '2,009,231 SHU' (sometimes called a Guinness record, e.g. UWI Today 2012) does not appear in NMSU's release. Moruga never held a Guinness record. The exact mean of 1,207,764 could not be traced to the HortTechnology paper.
• Red Savina: the Guinness 577,000 SHU was never reproduced. NMSU's replicated trial found 248,556.
• Bhut Jolokia record: it came from NMSU testing of seed collected in India and grown in New Mexico (2005 trial), not from 'a farm in India'. The NMSU paper was accepted Nov 2006 and published Apr 2007. NMSU's 2012 release says Guinness certified it in 2007, and some NMSU material says autumn 2006.
• GI date conflicts: Naga Mircha's Registry page header shows certificate date 02-12-2003, but the certificate document and Spices Board list point to 2008 (filed 2007; the Spices Board list repeats '2.12.2003'). Dalle Khursani was filed in 2018, published in the Journal in 2020-21 and certified on 14-09-2021; media say 2020 and the 2024 preprint says 2018. Byadgi's certificate is dated 27-01-2011 (reported as Feb 2011).
• Indian heat data is thin. Byadgi's NIFTEM handbook gives both 8,000-15,000 SHU and 0.8-1.3% capsaicin, and these cannot both be right. Kashmiri chilli's popular '1,000-2,000 SHU' figure is unsourced, while two HPLC/official figures imply about 21,000-52,000 SHU.
• We dropped Chocolate Bhutlah: Sources give only 'up to 2,000,000 SHU' or 'roughly 2,000,000'. PepperScale says 'a range of heat has not been established', and the breeder and origin are not documented. There is no number to cite responsibly. (The Douglah entry covers the related chocolate 7 Pot.)
• Primary sources we could not reach: the 2012 HortTechnology paper on super-hots (only NMSU's press release was read), any Winthrop University publication on the Reaper or Pepper X (only AP and Science Friday were read), Guinness pages for Naga Viper and Infinity, and the Tesco release body. These items are flagged in their source entries.