---
title: "Gemini Answers 77.1% of Health Questions Without Citing a Source vs 2.4% for ChatGPT - Suff Digital"
url: https://www.suffdigital.com/resources/data-studies/ai-sources-health-questions
description: "We turn websites into predictable revenue engines. Web design and SEO that drives revenue, not clicks. Nashville-based, senior US team."
lang: en
---

Gemini Answers 77.1% of Health Questions Without Citing a Source vs 2.4% for ChatGPT (https://www.suffdigital.com/resources/data-studies/ai-sources-health-questions)

Gemini gives no source at all in 77.1% of its answers to health questions, against 2.4% for ChatGPT. When AI answers do cite, the National Institutes of Health dominates: nih.gov appears in 32.3% of sourced health answers, three times the rate of the next website, the CDC.

All answers by rank

1

32.3%

2

10.6%

3

7.7%

4

7.1%

5

5.3%

6

5.2%

7

5%

8

4.9%

9

4.5%

10

4.1%

11

3.4%

12

3%

13

2.8%

14

2.4%

15

2.3%

Source: Suff Digital analysis of 1,600 AI answers to 400 health questions · ChatGPT and Gemini, September 2026

ChatGPT

Answers with no source

2.4%

Share of sourced answers citing it

38.3%

Share of sourced answers by industry

Health

32.3%

Fitness

41.5%

Recipes

37.5%

Real estate

27.2%

Software

24.3%

Pets

18.4%

Legal

14.7%

Money

13.8%

Travel

13.2%

College

13.1%

Home improvement

11.8%

Cars

6.7%

Source: Gemini Answers 77.1% of Health Questions Without Citing a Source vs 2.4% for ChatGPT - Suff Digital (https://www.suffdigital.com/resources/data-studies/ai-sources-health-questions)

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