Brandwave

Doctor’s Best vs Life Extension:Which is more popular?

In September 2026, Doctor’s Best had more branded searches than Life Extension among magnesium supplement brands worldwide. Doctor’s Best had about 4,400 branded searches, while Life Extension had 2,900. Doctor’s Best made up 4% of all magnesium supplement brand searches we track, and Life Extension accounted for 2.7%. When we asked ChatGPT and Google AI Overviews about magnesium supplement brands, Doctor’s Best and Life Extension each appeared in one of the four answers. Doctor’s Best and Life Extension were each mentioned first in one of the two answers that named either.

Among magnesium supplement brands worldwide in September 2026

Who do people search for more?

Doctor’s Best, about 52% more searches than Life Extension

Doctor’s Best 4.4K searchesLife Extension 2.9K searches

Who does AI mention more?

Both were mentioned in 1 of 4 answers.

Doctor’s Best in 1 of 4Life Extension in 1 of 4

Who does AI recommend more?

Each is named first in 1 of 2 answers.

Doctor’s Best first in 1Life Extension first in 1

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Top magnesium supplement brands in ChatGPT and Google AI Overviews

In three ChatGPT questions and one Google AI Overview, Doctor’s Best was mentioned in one out of four: in one of the three ChatGPT answers, but not in the Google AI Overview. Life Extension was mentioned in one out of four: not in any of the three ChatGPT answers, but in the Google AI Overview. Doctor’s Best and Life Extension were each listed first in one of the two answers that named either.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Thorne1st
  2. Nature Made2nd
  3. Pure Encapsulations3rd
  4. Now Foods4th
  5. Doctor’s Best5th
  6. Life Extension5th
  7. Natural Calm–
  8. BiOptimizers–
  9. Nature's Bounty–
  10. Moon Juice–
  11. +2 more

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Thorne4 of 4Named in 3 of 3 ChatGPT answersNamed in 1 of 1 Google answers
  • Pure Encapsulations3 of 4Named in 2 of 3 ChatGPT answersNamed in 1 of 1 Google answers
  • Nature Made2 of 4Named in 2 of 3 ChatGPT answersNamed in 0 of 1 Google answers
  • Now Foods1 of 4Named in 1 of 3 ChatGPT answersNamed in 0 of 1 Google answers
  • Doctor’s Best1 of 4Named in 1 of 3 ChatGPT answersNamed in 0 of 1 Google answers
  • Life Extension1 of 4Named in 0 of 3 ChatGPT answersNamed in 1 of 1 Google answers
  • Natural Calm0 of 4Named in 0 of 3 ChatGPT answersNamed in 0 of 1 Google answers
  • BiOptimizers0 of 4Named in 0 of 3 ChatGPT answersNamed in 0 of 1 Google answers
  • Nature's Bounty0 of 4Named in 0 of 3 ChatGPT answersNamed in 0 of 1 Google answers
  • Moon Juice0 of 4Named in 0 of 3 ChatGPT answersNamed in 0 of 1 Google answers

+2 more

See every answer about magnesium supplement brands

4 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in the United States on October 22, 2026.

Is Doctor’s Best or Life Extension more popular in search?

This chart shows how often people search Google for Doctor’s Best and Life Extension by name. Each line represents a brand's share of searches for all 12 magnesium supplement brands we track, month by month, from English-language searches worldwide.

Doctor’s Best and Life Extension among magnesium supplement brands worldwide, by month

Share of searches by month for Doctor’s Best, Life Extension. The figures are in the table below the chart.

View monthly share of searches table
MonthNatural CalmNature MadeBiOptimizersThorneNow FoodsPure EncapsulationsNature's BountyDoctor’s BestLife ExtensionMoon JuiceAncient MineralsJigsaw Health
Oct 202538.5%13.1%12.7%7.2%5.9%3.9%5.9%4.8%3.2%2.1%2.1%0.52%
Nov 202536.2%12.2%13.6%8.1%6.7%4.4%5.4%5.4%2.9%2.4%1.9%0.59%
Dec 202538.5%12.9%11.8%7.1%5.8%4.7%5.8%5.8%3.1%2%2%0.63%
Jan 202637.5%15.1%11.3%6.8%5.6%5.5%5.5%5.5%3%2%1.6%0.49%
Feb 202639.3%16.1%9.8%7.2%6%4.8%4.8%4.8%3.2%1.7%1.7%0.43%
Mar 202635.6%17.9%10.9%8%5.7%4.4%5.3%5.3%2.9%1.9%1.5%0.48%
Apr 202635.2%18%10.9%9.8%5.7%4.4%4.4%5.4%2.9%1.3%1.5%0.48%
May 202632.7%20.1%10%9%6.4%4.9%4.9%4.9%3.3%1.7%1.7%0.44%
Jun 202633.2%20.7%10.3%9.2%6.3%5%5%4.1%2.7%1.5%1.5%0.45%
Jul 202632.8%20.2%10%9%6.1%6%4.9%4%3.3%1.7%1.5%0.44%
Aug 202632.5%20.3%10.1%9.1%6.1%6%4.9%4%3.3%1.7%1.5%0.44%
Sep 202633%20.4%10.1%9.1%6.1%6.1%5%4%2.7%1.7%1.5%0.44%

How has the Doctor’s Best and Life Extension comparison changed over the last 12 months?

3 findings

How did search popularity change for magnesium supplement brands worldwide in September 2026?

2 changes

  1. In September 2026, Life Extension lost share of searches among magnesium supplement brands worldwide, from 3.3% to 2.7%.

  2. Estimated monthly branded searches for Doctor’s Best worldwide fell 18.5% over 12 measured months, from 5.4K to 4.4K in September 2026.

How are branded searches counted?

2 search terms

Brandwave collects information about searches that people make online using Doctor’s Best’s and Life Extension’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Doctor’s Best

1 branded search term

  • doctors best magnesium

Life Extension

1 branded search term

  • life extension magnesium

How the Brand Demand Index is measured

Other head-to-heads among magnesium supplement brands

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