AI Health Answers Cite YouTube More Often Than the NIH: 28.4% vs 26.7%

YouTube is the most-cited website in AI answers to health questions, appearing in 28.4% of sourced answers, ahead of the US National Institutes of Health at 26.7%. Overall, 67% of sourced AI health answers cite a government or medical source, but the rate ranges from 76.1% on ChatGPT to 33.6% on Gemini.

Sourced AI health answers citing it by website

youtube.com

28.4%

nih.gov

26.7%

clevelandclinic.org

15.1%

wikipedia.org

12.1%

mayoclinic.org

10.1%

healthline.com

9.8%

sleepfoundation.org

reddit.com

8.4%

facebook.com

6.8%

webmd.com

6.1%

harvard.edu

5.9%

cdc.gov

5.6%

Source: Suff Digital analysis of 4,248 AI answers to 548 health questions · answers from ChatGPT, Gemini and Google's AI features, September 2026

Sourced health answers citing a medical source by engine

ChatGPT

76.1%

Google AI Mode

66.5%

Google AI Overviews

65.3%

Gemini

33.6%

Source: Suff Digital analysis of 4,248 AI answers to 548 health questions · answers from ChatGPT, Gemini and Google's AI features, September 2026

Sourced answers citing a medical source by topic

General health

77.6%

Mental health

73.2%

Sleep

70.9%

Nutrition

40.8%

Source: Suff Digital analysis of 4,248 AI answers to 548 health questions · answers from ChatGPT, Gemini and Google's AI features, September 2026

Source: AI Health Answers Cite YouTube More Often Than the NIH: 28.4% vs 26.7% - Suff Digital