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Vitamin D Quiz

What Vitamin D Level is Natural?

In nature - almost like in the Stone Age - you can find vitamin D levels of  80/90/ 100ng /ml

in children in developing countries walking around in the tropical sun without any clothes to speak of.

If you then give them a shirt, trousers and a school building, the vitamin D level will drop  30/ 40ng /ml

and the more than a thousand known vitamin D deficiency diseases set in.

How do I recognize vitamin D deficiency?

  • At night: feeling cold, leg pains, restless sleep with sudden awakening.


  • During the day: limp, tired, powerless, lacking momentum

  • Midday and on exertion: dizziness and/or headache when standing up

  • Prolonged standing causes pain in: neck, lower back, groin, feet

  • Midday sun causes: circulatory problems, headaches, itchy skin, red spots

  • Cramps and/or twitches in: leg, arm, hand, eyelid

  • Often: cold hands, feet, legs and white fingertips

  • Fingernails have white spots

Vitamin D requirements for children

For the optimal development of your child, calculate the vitamin D requirement based on the weight! Use this free test here.

Vitamin D immediate therapy

A one-off dose of 5 mg vitamin D ensures a rapid increase in the vitamin D level within a few days.


This therapy is available for children as rickets prophylaxis with 5 mg Vigantol ®

For adults there is DEKRISTOL 20,000 ® with the content: 10 capsules, each x 20,000 IU  = 200,000 IU = 5 mg vitamin D.


In France, drinking ampoules with 200,000 IU (= 5 mg) of vitamin D have been available in every pharmacy for a long time.

With this one-time dosage, the vitamin D level increases by 20 - 30 ng/ml in medium-weight individuals.

Daily or weekly intake at a lower dose is ideal for maintaining vitamin D levels. As a second- best alternative , adults may repeat this vitamin D regimen of 200,000 IU once a month.

Accidental double ingestion is not toxic. Without additional vitamin D intake, the vitamin D level drops again within 4-6 weeks to such an extent that a new deficiency occurs.

Convert your vitamin D laboratory results

Convert " nmol / l " to " mg / ml " directly here

Some medical laboratories use the term "nmol / l" when specifying the vitamin D blood level.
Most recommendation tables for the target vitamin D blood level, however, use the term "mg / ml".
Below you can type in your "nmol / l" laboratory value and with the "convert" button you can immediately see your result in "mg / ml".

Vitamin D deficiency

Vitamin D Mangel als Risikofaktor

Extreme mortality associated with vitamin D levels below 12 ng/ml - this extreme deficiency is common among office and factory workers towards the end of winter.

Vitamin D News

News from worldwide research on vitamin D

Fatal error!
The doctor as a monopoly

Unfortunately, only a few doctors and pharmacists have the new vitamin D knowledge.


Far too often they advise against a dosage that would be effective.


This error can cause serious damage to health.

Why are so many people getting the coronavirus in India?
  • In India, people protect themselves from the sun because fair skin is considered a sign of higher caste.

  • Many people live in cities where the smog filters out the sun's rays.

  • Vitamin D deficiency affects large parts of the population: 50 - 93% of people have a vitamin D level below 30 ng/ml!

Doctors demand worldwide

introduce new guidelines so that vitamin D in tablet or drop form becomes the medical standard to prevent the severe courses of Covid.

Meanwhile, the vitamin D deficiency problem

recognized in Turkey:

There are reports on the radio and on NTV about the new recommendations for taking vitamin D.


The intake recommendation on the vitamin D products has also been changed in accordance with the new findings.

30,000 cancer deaths per year could be avoided with vitamin D.

Vitamin D supplementation could result in net savings of €254 million per year.


Our results show that vitamin D supplementation in older adults is a cost-effective approach to significantly reduce cancer mortality.

Vitamin D helps

also in people who already have cancer.

It lowers the death rate.

A vitamin D level of at least 20 ng/ml is absolutely necessary

to reduce the risk of death,​

because a vitamin D level below 20 ng/ml carries an extreme risk of dying from Covid-19.

Risikofaktor Vitamin-D-Mangel
A vitamin D level of at least 30 ng/ml is absolutely necessary

as a precaution,

because a vitamin D level below 27 ng/ml is a dangerous risk during the pandemic.

Known since 2017

Respiratory infections can be prevented by taking vitamin D.

Vitamin D-3 reduced the risk of acute respiratory infection in all participants .

These results support the introduction of public health measures such as food fortification to improve vitamin D status , especially in settings where severe vitamin D deficiency is common.

Known since 2014

Vitamin D deficiency is a global health problem.

The available data shows that vitamin D deficiency is a health problem in all age groups, especially in the Middle East.

Known since 2013

Vitamin D can be an effective means of preventing respiratory infection.

This is the result of aggregated data from 11 randomized controlled trials.

Known since 2012

Global Health Problem: Low 25 (OH) D levels are common in healthy adults

and can put you at risk of skeletal disease. Black and Asian adults have an increased risk of deficiency and the use of multivitamins has a protective effect.

Known since 2010

Vitamin D-3 supplementation during the winter season can reduce the incidence of influenza A.

This effect was particularly pronounced in school children. Furthermore Asthma attacks were also prevented with vitamin D-3 supplementation.

Known since 2009

Improving vitamin D status can be an effective strategy to lower annual death rates and extend lifespan.

An absolute risk reduction of the annual mortality rate of at least 2.2% would be possible if all German adults achieved a 25 (OH) D value above a value of at least 30 ng / ml .

Known since 2006

Vitamin D reduces the incidence of viral respiratory infections.

Ultraviolet radiation from either man-made sources or sunlight reduces the incidence of viral respiratory infections, as does cod liver oil, which contains vitamin D.

We conclude that vitamin D, or a lack of it, may be Hope-Simpsons "seasonal incentive." - see next article about Hope-Simpson

Known since 06.2020

We show for the first time that the active form of vitamin D,

Calcitriol, showing significant potent activity against SARS-CoV-2. This finding paves the way for considering host-directed therapies for ring prophylaxis of contacts of SARS-CoV-2 patients.

Known since April 2020

Our results suggest a vitamin D deficiency

may partially explain the geographic variation in the reported death rate from COVID-19, implying that vitamin D supplementation may reduce mortality from this pandemic.

Known since 1981

R. Edgar Hope-Simpson suggested that a "seasonal stimulus" closely related to solar radiation explains the remarkable seasonality of epidemic influenza.

or buy the vitamin D advice book directly:

Kathrin Dreusicke also has books  Books in German, English and Italian for the treatment of diseases such as back pain, allergies, depression, menopause and age-related macular degeneration. The "Self-Treatment Book Series" can be found here:

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