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My reaction was about the antagonists to bone health, something even doctors take for granted (the public is oblivious).

For example, drug & alcohol use, including pharmaceuticals, combined with poor gut health (low absorption) and kidney function (same).

There’s also another factor pertaining to hormonal imbalance which I believe triggers the body to sap calcium from the bones, but they probably won’t figure out that one for another few decades (if ever; no money in prevention). I can’t recall if they have a scientific name for that factor, but they do for the effects: Rickets/Osteomalacia. Thyroid health is a biggie, something which I believe pertains to a majority of the population (most people I speak with have more than a few symptoms of impaired thyroid health which shouldn’t be ignored, but they do anyway...until an unpleasant symptom expresses).

Cortisol is the one hormone many people fail to grasp/understand, as it’s not just “stress”. I’m a heavy critic of crossfit training as a non-athletic lifestyle to maintain health. I do not believe the elevated cortisol levels are healthy and if you look for it there’s evidence to support that assertion.

The only people who need D2/D3 are those who live in northern latitudes due to lack of sun exposure. Seasonally I take it from time to time, but certainly not for anything related to bone health. Others who have a perceived need are probably for other reasons which should be explored, not masked by consuming a supplement (symptoms are markers for investigation; who paints over dry rot?).

True story: When I realized I had an imbalance of D years ago it was after I responded to one of those radio commercials about a free trial (something I almost never do). After a bit of research, I called and took them up on it. I realized no perceived benefit from the 30 days of the D3, but the following year I had been struggling with fatigue (this was prior to my health recovery when I was a hormonal wreck. Male, btw).
I was engaging a yard project and realized in retrospect after working 2 days in the sun (WITH a shirt) I felt energized. It was like I plugged into some recharging station. 2 weeks later the fatigue returned and I worked in the yard for a mere 2 hours this time: Same recharging results. In hindsight, I now know that I had a combined hormonal imbalance, poor kidney function and lousy absorption due to gut issues. I haven’t had the need to take D for several years now, but it’s in my cupboard if I start feeling the fatigue (unless I have some work to do outside).

To be clear, I am a proponent of real food and “real food supplements” and opponent of ingestion the prior PLUS USP and pharmaceutical chemicals for either prevention or symptom abatement without first investigating other factors (good luck doing that with an orthodox “doctor”).

Self-medication can be more dangerous than doing nothing at all, the result suddenly presenting after decade(s) of progressive damage.

Pertinent supplemental information since most people don’t have a clue the complex biological processes behind what supplement manufacturers proffer to fix with “a pill” (sorry for not formatting...too busy):

Vitamin D is a fat-soluble vitamin. It exists in four different forms: cholecalciferol, calcifediol, calcitriol, and ergocalciferol.

Forms of Vitamin D
Cholecalciferol: This form is also called vitamin D3, and it’s made from cholesterol in your body when your skin is exposed to ultraviolet light. For most of us, it takes about 5 to 30 minutes of sun exposure two days each week to make sufficient amounts of vitamin D though it varies based on weather conditions and time of year. Cholecalciferol is not biologically active; it has to travel through your bloodstream to the liver where is it converted into another form of vitamin D called calcifediol.

Calcifediol: The storage form of vitamin D is called 25-hydroxyvitamin D or calcifediol. It’s also the form of vitamin D that’s measured in blood tests when your health care provider wants to determine when you have symptoms of vitamin D deficiency. If your calcidiol levels are low, you may not be making enough vitamin D, which can lead to a softening and weakening of your bones. In children, this is called rickets and in adults, it’s called osteomalacia. Osteomalacia can result in osteoporosis.

Calcitriol: Your kidneys take calcifediol and convert it to the biologically active form of vitamin D called 1,25-hydroxyvitamin D, or calcitriol. This kind of vitamin D promotes calcium absorption and helps balance the blood levels. It also has a role in normal cell growth and nerve and muscle function. Calcitriol is also necessary for a healthy immune system and may help to reduce inflammation. Your body regulates your blood levels of calcitriol very carefully, so it isn’t a proper form for testing or monitoring vitamin D deficiency. In fact, calcitriol levels may remain normal while calcifediol levels begin to drop.

Ergocalciferol: Vitamin D2, or ergocalciferol, is similar to cholecalciferol, but it’s the form of vitamin D synthesized in plants. Your liver can convert ergocalciferol to the calcifediol. It isn’t converted to calcidiol as efficiently as cholecalciferol, but it appears to be sufficient for use as a dietary supplement.

Where Does Vitamin D Come From?
Vitamin D isn’t found in many foods unless they have been fortified, such as milk, yogurt, soy milk and breakfast cereals. Small amounts of vitamin D are found in oily fish and beef liver.

Your body makes vitamin D when your skin is exposed to the ultraviolet B (UVB) rays in sunlight. About 5 to 30 minutes of exposure to the skin on your face, arms, back or legs (without sunscreen) two times every week is enough.

But, too much exposure to sunlight is a risk for skin cancer, so you should use sunscreen after a few minutes in the sun, even on hazy or cloudy days.

The amount of exposure also depends on the time of the year. In the northern hemisphere, the UVB rays are more intense during the summer months and less intense during the winter months. In fact, if you live north of the 42-degree latitude, you’ll have a difficult time getting enough sun exposure from November through February.

Picture a map of North America. If you live north of a line drawn on a map from the northern border of California to Boston, Massachusetts, you will probably need to get more vitamin D from the foods you eat (or from supplements) during the winter months, even if you do go outside every day.

The intensity of UVB rays is also reduced by clouds and pollution. The UVB rays will not travel through glass so sitting next to a window will not give you enough sunlight to make vitamin D.

Why Do You Need Vitamin D?
Your body needs vitamin D to absorb and utilize calcium, which keeps your bones and teeth strong, and is essential for normal blood clotting and muscle and nerve function.

A vitamin D deficiency can happen if you don’t get enough sun exposure, if your kidneys cannot convert the storage form to the active form, or if you can’t absorb vitamin D from due to problems with your digestive system. A chronic lack of vitamin D leads to weakened bones and diseases called rickets in children and osteomalacia in adults.