[hatsunearu]

30 minutes in the sun is enough to get your daily dose iirc.

I think I get 30 minutes from going outside for lunch and walking to my car, driving, taking out the trash, getting my mail, etc.

[basisword]

I’m not sure how correct that is. Particularly in certain countries and especially in winter. I get out for more than 30mins every day and my levels are deficient when I tested.

[bqmjjx0kac]

It also depends on your skin color and latitude.

[itake]

+1. I was deficient, despite averaging 7000 steps per day (80 min of walking). I also live in seattle and stay bundled up

[PartiallyTyped]

Copenhagen in the winter will have you sit outside all day. All 6 hours of it.

[jgalt212]

it varies greatly person to person.

[jessicas_rabbit]

In order to produce vitamin D, your skin needs continuous time in the sun to fully react with sunlight.

30 minutes of continuous chemical reaction will have vastly different effect than a reaction that stops & starts repeatedly, for a sum total of 30 minutes.

[cyberax]

You actually are going to synthesize _more_ vitamin D if you do fractionated exposure.

That's because vitamin D synthesis is an equilibrium reaction, UV drives backward and forward reactions. So you'll get more vitamin D if you expose your skin to the sun for a few minutes, then let the synthesized vitamin to diffuse out of the skin layer, and then expose yourself again.

[jessicas_rabbit]

That makes sense. Thanks for explaining.