\"Wild Nutrition Food–Grown® Vitamin D provides a high strength of 1000iu which is highly absorbable, biologically active (not storage) form of vitamin D3. This naturally includes all forms of vitamin D, including vitamin D3, D2 and D1. High absorption and retention in the body reduces the need for high dosing long term. Public health advice recommends supplementation for all during autumn and winter, and for certain individuals or \'at risk\' groups during spring and summer too.The Department of Health recommends: Everyone over the age of four should take 10 micrograms (400 iu) of vitamin D every day, particularly from October to March. All pregnant, breastfeeding women and at-risk groups (such as people from ethnic minority groups with dark skin, elderly people in care homes and those who wear clothing that cover most the skin) should take a daily supplement containing 10 micrograms (400iu) of vitamin D. However, consider that many people in the UK do not get good access to consistent sunlight due to work (offices) and \'typical British\' summer weather (cloudy days and rain).All babies from birth up to one year of age should take 8.5 to 10 micrograms (340iu to 400iu) of vitamin D per day (particularly those being breastfed).Babies fed infant formula will not need vitamin drops until they are receiving less than 500ml (about a pint) of infant formula a day, as these products are fortified with vitamin D.Children between the age of one and four should take 10 micrograms of vitamin D supplements all year round. People aged 65 years and over and people not exposed to much sun should also take a daily supplement containing 10 micrograms (400iu) of vitamin D.It\'s important to comprehend that more than 400iu (10ug) may be safely taken by adults since recommendations are to make sure people meet minimum requirements. Individual requirements will of course vary and some may need more than 400iu (10ug), especially if your levels are low. You should always check with a qualified nutritionist / nutritional therapist if you are unsure what dose to take.\"