Should you store e-liquid in the fridge? The 24-month trial with a 4 C dark arm says yes for flavour. We read it; the retailers arguing do not cite it.
Nicotine oxidation is why e-liquid turns dark brown in the bottle. We read the forced-degradation data on what heat, light and oxidation do to nicotine.
No, the reverse: a Health Canada trial found salt liquids kept 85% of their nicotine to freebase's 74%. The spread inside each format is the real story.
Three archived Health Canada recall notices for bottled e-liquid publish batch codes, volumes and per-flavour nicotine strengths that the brands themselves, in the material we could open, do not print where a buyer can read them.