The three most common ingredients in muscle pain ointments under the microscope of research. Mechanisms, duration of action, and what the Cochrane review says about the strength of evidence for each of them.

Excess iron: why EFSA did not establish an upper limit for it, how free iron damages cells, and which groups should not supplement without testing.

Iodine and Lugol's solution: intake norms, European and American upper limits, risk of excess with thyroid issues, and what a 2017 study showed about Poland.

Human studies have not shown higher exposure to CBD from nanoemulsions than from oil. What nanoemulsion really changes and where the percentages of bioavailability come from.

HHCH is hexahydrocannabihexol, an HHC homolog with a six-carbon chain. Check how it is produced, what is unknown about it, and what Polish law says.

The 0.3% THC threshold comes from a taxonomic work from 1976, not from clinical studies. Check how it made its way into the law and how it is counted today in Poland.

What came out of large trials on multivitamins: a meta-analysis of 91,074 people, a cohort of 390,124 people, and one trial with a positive result. Upper limits of EFSA and interactions.

How many CBD products contain lead, cadmium, or arsenic, what limits apply in the EU, and what an analysis certificate won't tell you. Numbers from studies, with the sample provided.

Distillate or CBD isolate? How they are made, what studies say about the entourage effect, which one poses a risk of a positive THC test, and what the 0.3% threshold really refers to.

THC, CBD, and the architecture of sleep. What polysomnography showed in 1449 individuals, why the figure of 20-30% REM suppression has no source, and what is unknown about withdrawal.

Hepcidin after an iron dose closes the intestine for a day. What exactly Moretti 2015 and Stoffel 2017 measured: doses, populations, results, and the EFSA limit.

Convection, conduction, and hybrid in the vaporizer: how they differ, how they heat, what temperature makes sense, and what measurements comparing vapor to smoke showed.