alt Hacker NewsInteresting... What benefits does this have over vitamin D supplements?
I've seen this "optimising for some perceived negative effects" thing with toothbrushes/toothpaste, where "whitening" and stiff bristles actually just means removing more (irreplaceable) enamel from your teeth.
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Vitamin D supplements don’t work consistently across different populations. Very few (~10%) of people can absorb dietary vitamin D. If you aren’t some form of Northern European, you probably need to take at least 10 times the daily recommended dose of vitamin D to influence your levels significantly.
Most people need sun!
Stiff bristles also damage your gum more easily and can lead to gum recessions. I needed gum transplants because of this and a wrong brushing technique. For me even medium stiffness is too hard.
Many people with inflammatory disease like IBD can't absorb oral vitamin D properly
Even in healthy people, oral vitamin D is not always sufficient (there was a study done in Japan where sunlight is low but Vitamin D from fish is high - can't find it right now) and sunlight exposure might have other benefits than vitamin D anyway
https://www.sciencedirect.com/science/article/pii/S0022202X2...