About this item

  • Highest potency
  • Helps maintain strong bones
  • Supports immune system
  • GMP quality assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation).
  • Vitamin D3 5000 IU is an exceptional supplement containing 5000IU of vitamin D3 (the most bioavailable form) per softgel. It is enriched with sunflower oil to maximise its absorption.

    Daily or twice a week supplementation with Vitamin D3 5000 IU produces a rapid increase in circulating levels of the vitamin, as confirmed by blood tests, and has a positive effect on cardiovascular, endocrine, nervous system, immune and cognitive function.

    Who is Vitamin D3 5000 IU aimed at?

    The latest studies show that between the months of October and April, almost everyone (1-4) living at a high latitude has an inadequate level of vitamin D (5-6). March sees levels reach their lowest point (7-8).

    Vitamin D3 5000 IU is thus aimed at anyone living in France, Italy, Germany, Spain, the Netherlands, Portugal, Poland, the UK, Canada and the United States throughout autumn and winter.

    Vitamin D is produced by the body on exposure of the skin to the sun’s ultra-violet rays (UVB). However, in temperate regions of the Northern Hemisphere, the conditions are not conducive to this process, both because of the sun’s angle of elevation and the weather during these seasons, as well as urban lifestyles: at this time of year, we tend to stay indoors and cover ourselves up too much to maintain adequate vitamin D production. Peak production rapidly plummets from November onwards and reserves are quickly exhausted.

    Vitamin D3 5000 IU can also be used in the spring and summer by many groups of people (40% of individuals have inadequate levels even during these periods):

  • Those with dark skin who live at high or middle latitudes, because they need more sun than a fair-skinned person to produce the same amount of vitamin D.
  • Those who are less mobile or who do not get much exposure to the sun.
  • Those who are overweight, because vitamin D produced from the sun’s rays is sequestered by the fatty layers under the skin.
  • Those over 50 (9), both due to less exposure to the sun (delicate skin) and less efficient conversion of vitamin D precursors into vitamin D in the superficial epithelial layers of the skin.
  • Those suffering from bone disease.
  • Those with malabsorption problems and inflammatory bowel disease because this makes absorbing fats more difficult.
  • Those following specific diets (excluding meat, fish, eggs or products fortified with vitamin D).
  • Those living in areas of high pollution, as CO2 absorbs UV rays.
  • Those who regularly use UVB-blocking sunscreens (with an SPF above 15) as these can prevent up to 99% of UVB from penetrating the skin.
  • For all these groups of people, Vitamin D3 5000IU is often the safest way of quickly increasing their levels of vitamin D and of maintaining them throughout the year, now available to buy at Supersmart.

    What are the effects of too little vitamin D?

    Vitamin D is not really a vitamin: it should actually be thought of as a hormone. It performs many functions in the body, the best-known of which are its key roles in the intestinal absorption and binding to bones of dietary calcium, in muscle function, in maintaining cognitive function, in supporting the immune system and in tissue cell renewal.

    The effects of a lack of vitamin D may go unnoticed for years but in the long term, they can be serious: softening of bones (osteomalacia), osteoporosis, bone pain, muscle weakness, joint pain (particularly in the wrists, ankles and shoulders), migraines, increased risk of depression, insomnia, hair loss (10) …

    Conversely, optimal vitamin D levels bring numerous benefits for our health:

  • Optimisation of bone health (11-13).
  • Reduced risk of cardiovascular disease and stroke (at doses of at least 600IU a day (14)).
  • A decrease in blood pressure (at doses of at least 2000IU a day (15)).
  • Improved blood cholesterol levels (at doses of at least 2000IU a day (16)).
  • Increased strength and muscular balance (at doses of at least 800- 1000 IU a day (17)).
  • Reduced risk of neurocognitive problems and auto-immune diseases.
  • Potential reduction in fibromyalgia pain (at doses of at least 2400 IU a day) (18).
  • What is the optimal intake for vitamin D?

    There is still debate about which vitamin D blood levels produce benefits. The very latest evidence suggests that circulating levels in excess of 50 nmol/L, or even 75 nmol/L, may be optimal for overall health. Those below 30 nmol/L, on the other hand, are associated with adverse effects on health.

    Achieving a blood concentration of 75 nmol/L often requires supplementation with at least 2000IU a day. In the same vein, taking 3000IU a day for eight weeks has been shown to result in a concentration of more than 75 nmol/L of 25(OH)D (19-20).

    In 2010, more than 40 international scientists called for greater awareness among doctors of the importance of vitamin D in preventing osteoporosis and cardiovascular disease. They recommended that the entire Western population (living at middle latitudes) should supplement with 1000-2000IU, especially from October to March.

    What about dietary intake?

    There are very few sources of vitamin D in the diet. They are mainly restricted to animal-sourced fats, particularly those from oily fish, and fortified foods such as dairy products, and some vegetable oils and plant-based drinks.

    According to the French SUVIMAX study, the diet may only provide an average of 136IU of vitamin D a day. It is thus the body’s endogenous production from UV-B which is primarily responsible for circulating levels.

    How does Vitamin D3 5000 UI differ from other such supplements?

    Vitamin D3 5000 UI is an exceptional supplement that you can choose to buy for at least three main advantages:

Most elderly people are deficient in vitamin D but not all will develop Alzheimer’s disease. It is therefore unlikely that a lack of vitamin D is the only factor responsible for the onset of the disease and that supplementing with vitamin D alone will be enough to prevent it (42).

How should Vitamin D3 5000 IU be taken?

Vitamin D3 5000IU should be taken alongside the meal of the day with the highest fat content. Doing so will increase the supplementation’s efficacy by 30%-60%. Fats encourage bile secretion which increases the absorption of vitamin D.

You can check how effective Vitamin D 5000IU is by asking your doctor for a 25-hydroxyvitamin D test (40) before and after supplementation. It’s the best biomarker of vitamin D (41).