Data Analyzed by Forth With Life Revealed 74 by cent of UK adults aged 25 and over.
The data also showed 27 per cent fell below the normal range.
By age group, 76 per cent of those aged 25 to 34 and 45 to 54 showed the biggest lack of vitamin D.
35 to 44 and 71 per cent of 55 to 65 year olds.
By gender, 77 per cent of women showed inadequate vitamin D levels versus 72 per cent of men.
According to Forth With Life, the normal range for vitamin D is between 50 and 175 nmol / L. Levels above 75 nmol / L are advised for optimum health.
The main source of vitamin D is Sunlight, but still 2018 Seeing one of the hottest summers on record in the UK.
Forth With Life.
"Healthy Vitamin D"
"However, increasing the number of sunshine hours in the UK is four hours less than the month since the mid-1990s."
People who receive less exposure to the sun are those who spend a little time outdoors.
Being overweight can also be considered as a health firm.
It is important for the body to have enough vitamin D, as well as in the case of severe musculoskeletal disorders, depression, and fatigue.
Aside from Sunlight, it's possible to obtain vitamin D from the sun, beef liver, cheese and egg yolks.
Some foods such as dairy products, orange juice, soy milk and cereals are also fortified with vitamin D.
During the winter when there is less sunlight, you have to take a vitamin D supplement to get the required amount.
Forth With Life Founder Sarah Bolt, "The UK population needs to be aware of the importance of vitamin D".
“Almost three-Quarters of Forth's customers are in the bottom quartile (50 to 81.25 nmol / l) or below, averaging 72 nmol / L. The data gives a worrying insight into the state of the wider UK population's vitamin D levels. "
"Knowing your vitamin is the only way to help you get rid of the effects of depression."
"Gaining an insight and understanding of your body's key biomarkers, such as vitamin D"