Given that freeze-drying technology is not inherently extraordinary, why are freeze-dried powders currently so popular? Aside from commercial marketing efforts, the primary advantage of freeze-drying lies in its ability to fully preserve the biological activity of substances.
We are all aware that certain ingredients-such as Vitamin C (VC) and Epidermal Growth Factor (EGF)-are prone to oxidation and contamination under standard storage conditions; over time, they lose their biological activity and cease to deliver their original efficacy.
Once converted into a freeze-dried powder, these substances become inhospitable to bacterial growth (due to the absence of water) and are protected from oxidation (thanks to vacuum packaging), thereby significantly extending their shelf life.
In essence, freeze-drying is merely a preservation method; the actual therapeutic effect is derived from the preserved substance itself. Consequently, there is no significant difference in efficacy between a Vitamin C oil and a freeze-dried Vitamin C powder of equivalent concentration.