How to read research, assess an ingredient and choose a test
Short explanations of questions that come up again and again, to make it easier to see what is worth checking before you decide. The content is general and does not replace medical advice.
What do you actually check before choosing a supplement?
Start with the goal: what you want to improve, what you eat, which habits you already have and what is known from your medical workup.
Then look at the ingredient itself: the amount, how it is used, the research and how well it suits you personally. Vitamin C, for example, is needed for the body to make collagen. From there you still need to check whether a supplement is needed and what suits the person in front of you.
The same approach applies to magnesium, fiber, plant-based ingredients and other supplements. That an ingredient matters in the body does not mean everyone needs to take it as a supplement.
The choice also takes into account medications, sensitivities and medical conditions, with the help of a suitable professional when needed.
Personal tests: what can help you make a decision?
Different tests answer different questions. A complete blood count can be part of a medical workup. HbA1c reflects the average blood sugar level over the past few months. Other tests are chosen according to symptoms, history and need.
Even during periods of hormonal change, not everyone needs a hormone panel. A doctor tailors the workup to the situation and the stage of life.
Genetic tests can be useful for specific questions, but they do not guarantee a perfect match of nutrition or supplements. Before choosing a test, ask what its result would actually change.
"Detox": start with what can be defined
The liver and kidneys play central roles in clearing substances from the body. A program that promises to "remove toxins" should explain which substances it means and how it was shown that they were cleared.
My approach focuses on clear steps: varied nutrition, fiber, suitable hydration, activity and cutting back on alcohol. Tracking follows habits, function and how you feel, with a medical workup when needed.
Tiredness or difficulty losing weight should not be put down to "toxins" or parasites without a proper workup.
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Going deeper
Hydrogen and oxygen: how do you read the research behind the headlines?
Studies on hydrogen-enriched water have looked at metabolic markers and inflammation markers, among other things. Some reported interesting results, but this is a field that still needs larger and more consistent studies. You cannot conclude from them that every device or every concentration gives the same result, or that aging is halted.
Hyperbaric oxygen therapy has also been studied in various areas, including certain markers related to aging. It is a medical treatment that requires tailoring and supervision. A change measured in blood cells in a study is not proof that the whole body has been made younger.
Before choosing a solution, check what exactly was studied, in which population, with which protocol, and what it means for real life.
Sources and details of the studies
For each topic on this page, what the source examined. The sources are general and are not personal advice.
- NIH Office of Dietary Supplements, Vitamin C Fact Sheet for Health Professionals: a review of the roles of vitamin C in the body, including collagen formation.
- MedlinePlus (US National Library of Medicine), Complete Blood Count (CBC): what a blood count measures and in which situations it is used.
- MedlinePlus, Hemoglobin A1C (HbA1c) Test: a test that reflects the average blood sugar level over roughly the previous two to three months.
- NICE (UK), Quality statement 1 of QS143: at age 45 and over with menopause symptoms, it is accepted practice to diagnose from the symptoms without hormone tests, when there is no suspicion of another cause.
- NCCIH (NIH), Detoxes and Cleanses: What You Need To Know: a review of claims about "detoxing". Human studies are few and of low quality, and no convincing support was found for removing toxins.
- Jamialahmadi et al., 2024, systematic review and meta-analysis of hydrogen-enriched water and blood lipids: eight controlled trials with about 350 participants with metabolic disorders. A small sample that points to the need for broader studies.
- Hachmo et al., Aging (Albany NY) 2020;12(22):22445-22456: a small trial without a control group, with about 35 healthy adults aged 64 and over, who received 60 hyperbaric oxygen sessions. Telomere length and senescent cells in blood cells were measured, not health outcomes.