Table 1.

Recommended intakes of vitamins D and C to support optimal immunity for the wider population

Nutrient	Justification	Recommendation
Vitamin D	Revision of the current UK guidelines is advocated (82). 10 μg/d is not sufficient for individuals in at-risk groups at any time (82). 10 μg/d is not sufficient for individuals between October-April in cold, Northern Hemisphere countries (77).	Daily intake of 50 μg/d (84, 85) [Daily intake of 50-125 μg/d has been advised dependent on age, risk, and time of year (11).]
Vitamin C	40 mg/d is not sufficient for UK adults (86). EU guidance for adults is 95 mg/d (87). Higher daily doses (≥200mg/d) are required for optimal immune function (84).	Daily intake of 200 mg/d (84) [Daily intake of 1-2 g/d for individuals who are unwell (84)]