The primary purpose of this study is to compare the safety and effectiveness of commercially available dietary supplements believed to increase coenzyme Q10 (CoQ10) concentrations.

An 8-week, randomized, placebo-controlled clinical trial will be conducted comparing the effectiveness of four commercially available dietary supplements on increasing CoQ10 concentrations and self-reported health outcomes.

Inclusion Criteria:

1. Adult males or females age ≥ 40 years
2. Ability to read and speak English

Exclusion Criteria:

1. Daily use within the past 2 months of any dietary supplements containing CoQ10 or geranylgeraniol (GG)
2. Taking a statin medication within the past 6 months
3. Current daily usage of H2 blockers or PPI medications
4. Current daily use of bisphosphonates
5. Current daily tobacco smoker
6. Known allergies to any substance in the study products
7. Currently pregnant or lactating women or women planning to become pregnant in the next 12 weeks
8. Current diagnosis of a chronic health condition (e.g., cancer, Crohn's disease) deemed clinically contraindicated for the study protocol.
9. Participant in a clinical trial in the previous 30 days.
10. Participants unable to provide consent

Deidentified participant data will be made available upon reasonable request.

The IPD and supporting information will be available within 6 months after the completion of the study.