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Which genes does a DNA test examine? The scope explained honestly The essentials at a glance A lifestyle DNA test examines genetic variants with an established connection to nutrition, metabolism, nutrient requirements, exercise, and recovery. More than 700,000 predefined positions...

Which DNA test is right for me? Five analyses, one way to choose The essentials at a glance The choice does not begin with the test, but with your goal. Someone who wants to lose weight needs different reports from...

Training in an energy deficit is reflected in several values The key points Taking in less energy than you expend over an extended period changes more than just your weight. Several laboratory values may shift as well. The MSD Manual...

What your skin reveals about your blood values The key points at a glance Less than the headline promises. The specialist sources associate specific deficiency states with signs in the skin, hair, and nails—in other words, they start with the...

Preparing for a blood draw: what matters The essentials at a glance Many fixed rules with specific time requirements circulate around blood draws. The sources examined do not state them in this form. What it says is more precise: which...

How often to test blood values: what can be inferred The essentials at a glance There is no recommendation for healthy people without a specific reason on how often blood values should be measured. We looked for one and found...

Vitamin D3 and K2: what is substantiated about the combination The essentials at a glance The two letters appear together on many packages. They do not appear together in the reviewed professional sources. A great deal has been documented about...

Magnesium in serum and whole blood: two different messages The essentials at a glance One thing about magnesium is clearly documented: The serum value reflects the amount in the body poorly. The medical literature states this with unusual clarity. This...

Measure first, then supplement: the case for it The essentials at a glance IQWiG answers the question of whether dietary supplements are beneficial in three words: generally not (as of September 3, 2025). However, the same source mentions an exception,...