Category AI Visibility Report
Vitamin C Supplements AI Visibility Report 2026: Top Brands & Buyer Topics in AI Search
Data updated 2026-08-27 · 30-day window · ChatGPT · Google AI Mode · Google AI Overviews
≈4,375
Est. AI queries / month
10
Buyer topics monitored
10
Brands on the AI shelf
Key insights
- Over the last 30 days, GEOly monitored 10 buyer topics in Vitamin C Supplements across ChatGPT, Google AI Mode, Google AI Overviews — an estimated 4,375 AI queries per month.
- NOW Foods leads the AI shelf with 15.2% of brand mentions, followed by Thorne (9.5%) and Nature Made (8.9%). The top three hold 33.6% combined — a shelf that has not consolidated yet, leaving a clear window for challengers.
- The highest-demand topic is “Vitamin c supplements for women” (top keyword “how much vitamin c per day for a woman”, ~8,100 searches/mo).
- AI answers lean on nih.gov most (45.3% of citations) — earning presence on these sources is the shortest path to being recommended.
Brands AI recommends most
Share of brand mentions across AI answers in the last 30 days (Share of Model).
| # | Brand | AI mentions | Share |
|---|---|---|---|
| 1 | NOW Foods | 278 | 15.2% |
| 2 | Thorne | 173 | 9.5% |
| 3 | Nature Made | 162 | 8.9% |
| 4 | Pure Encapsulations | 103 | 5.6% |
| 5 | American Health Ester-C | 101 | 5.5% |
| 6 | Solgar | 80 | 4.4% |
| 7 | Kirkland | 56 | 3.1% |
| 8 | Quicksilver | 48 | 2.6% |
| 9 | Garden of Life | 44 | 2.4% |
| 10 | LivOn Labs | 36 | 2% |
What shoppers ask AI
Buyer topics monitored in this category, with estimated monthly AI queries and the top Google keyword behind each topic.
| Topic | Est. AI queries / mo | Top keyword | Search volume / mo |
|---|---|---|---|
| Vitamin c supplements for women | ≈1,863 | how much vitamin c per day for a woman | 8,100 |
| Vitamin c supplements for pregnancy | ≈1,683 | vitamin c supplements in pregnancy | 1,000 |
| Natural vitamin c supplements | ≈829 | citrus vitamin c | 33,100 |
| Vitamin c supplements powder | — | vitamin c powder | 9,900 |
| Liposomal vitamin c supplements | — | liposomal vitamin c | 22,200 |
| Vitamin c supplements with iron | — | vitamin c with iron supplements | 8,100 |
| Best vitamin c supplements | — | vitamin c | 165,000 |
| Vitamin c supplements for skin | — | vitamin c supplements for skin lightening | 2,400 |
| Vitamin c supplements tablets | — | vitamin c tablets | 12,100 |
| Buffered vitamin c supplements | — | buffered vitamin c supplements | 2,900 |
Sources AI cites in this category
Root domains AI engines cited most when answering category queries in the last 30 days.
| Domain | Citations | Share |
|---|---|---|
| nih.gov | 358 | 45.3% |
| iherb.com | 64 | 8.1% |
| healthline.com | 54 | 6.8% |
| reddit.com | 44 | 5.6% |
| consumerlab.com | 44 | 5.6% |
| verywellhealth.com | 41 | 5.2% |
| nowfoods.com | 18 | 2.3% |
| vogue.com | 15 | 1.9% |
Related category reports
FAQ
Which brands do AI assistants recommend most for vitamin c supplements?
Over the last 30 days the top brands by AI mention share are: NOW Foods (15.2%), Thorne (9.5%), Nature Made (8.9%), Pure Encapsulations (5.6%), American Health Ester-C (5.5%). Data from GEOly's continuous monitoring across ChatGPT, Google AI Mode, Google AI Overviews.
How many people ask AI about vitamin c supplements?
GEOly estimates ~4,375 AI queries per month in this category across 10 buyer topics, led by “Vitamin c supplements for women”.
Which sources do AI engines cite for vitamin c supplements?
The most-cited domains are: nih.gov, iherb.com, healthline.com, reddit.com, consumerlab.com. Building brand presence on these sources is the most direct way to win AI recommendations.
Methodology
GEOly continuously runs category buyer prompts across ChatGPT, Google AI Mode, Google AI Overviews and records which brands are mentioned and which sources are cited. Figures aggregate a 30-day window; AI query volumes are modeled estimates from keyword demand and AI-adoption share. Data: GEOly MCP Server, updated 2026-08-27.
See your brand inside this category
GEOly tracks how ChatGPT, Google AI Mode and Google AI Overviews mention, rank and cite your brand against every competitor above — and what to fix to win the AI shelf.