Yes, there are many scientific studies that evaluate the effectiveness of various health products and supplements. Some of the key things that reputable studies look at include:

- Double-blind, placebo-controlled studies. These are studies where neither the participants nor the researchers know who is receiving the actual supplement vs. a placebo. This helps control for the placebo effect and confirmation bias.
- Large sample sizes. Larger studies with more participants help ensure the results are more representative and generalizable. Small studies can be more prone to anomalies and bias.
- Independent studies. Studies sponsored by the companies that sell the products are more prone to bias, so independent studies not funded by companies are more credible.
- Specific and measurable outcomes. The best studies look at specific, quantifiable health outcomes and metrics to determine the effects, not just self-reported outcomes or anecdotes.

Some reputable sources that review scientific studies on supplements and health products include:

- Cochrane Reviews: Cochrane.org. Cochrane conducts systematic reviews of research studies.
- Office of Dietary Supplements from the NIH: Ods.od.nih.gov. They provide resources on a wide range of dietary supplements.
- ConsumerLab.com: They independently test and review numerous supplements and provide reviews based on ingredients, safety, and effectiveness.
- Various scientific and medical journals, like the Annals of Internal Medicine, JAMA, Nature, etc. You can search for specific supplement names and "clinical trials" or "systematic review" to find studies published in these journals.
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