In what appears to be a position paper by the ESPGHAN Nutrition Committee - they write: "A position paper based on a systematic search by the ESPGHAN Nutrition Committee" - you can find recommendations on what amounts of vitamin D vegan children and adolescents should supplement.
I just copied and pasted their Supplementary Table 3:
Supplemental Table S3. Recommended vitamin D intake and supplementation in children on a vegan diet.
|
Age |
Adequate intake for general population (EFSA - AI)* (mg/day) |
Supplementation for vegan diet** |
Tolerable upper intake level (EFSA - UL)* (mg/day) |
|
4-6 months |
- |
· Infants adopting vegan diet up to 1000 IU/day (25 (mg/day) § |
25 (1000 IU) |
|
7-11 months |
10 (400 IU) |
35 (1400 IU) |
|
|
1 - 3 years |
15 (600 IU) |
·
Children and adolescents adopting vegan diet up to 1000
IU/day (25 (mg/day) §§ |
50 (2000 IU) |
|
4 - 6 years |
15 (600 IU) |
50 (2000 IU) |
|
|
7 – 10 years |
15 (600 IU) |
50 (2000 IU) |
|
|
11 -14 years |
15 (600 IU) |
100 (4000 IU) |
|
|
15 – 18 years |
15 (600 IU) |
100 (4000 IU) |
§ According to Saggese
et al., the risk factors for vitamin D deficiency during the first year of life
are: Non-caucasian ethnicity with dark skin pigmentation; Vegan diet or
inadequate diet; Chronic kidney disease; ; Hepatic failure and/or cholestasis;
Malabsorption syndromes (i.e. cystic fibrosis, inflammatory bowel diseases, coeliac
disease at diagnosis, etc.); Chronic therapies: anticonvulsants, systemic
glucocorticoids, antiretroviral therapy, systemic antifungals (i.e.
ketoconazole); Infants born from mothers with multiple risk factors for vitamin
D deficiency, particularly in absence of vitamin D supplementation during
pregnancy.
§§ According to Saggese
et al., the risk factors for vitamin D deficiency between 1 and 18 years are:
Non-Caucasian ethnicity with dark skin pigmentation; Reduced sunlight exposure
(due to lifestyle factors, chronic illness or hospitalization, complex
disability, institutionalization, covering clothing for religious or cultural
reasons) and/or constant use of sunscreens; International adoption; Obesity;
Vegan diet or inadequate diet; Chronic kidney disease; Hepatic failure and/or
cholestasis; Malabsorption syndromes (i.e. cystic fibrosis, inflammatory bowel
diseases, coeliac disease at diagnosis, etc.); Chronic therapies:
anticonvulsants, systemic glucocorticoids, antiretroviral therapy, systemic
antifungals (i.e. ketoconazole).
*European
Food Safety Authority [European Food Safety Authority (EFSA) Dietary Reference
Values for the EU and European Food Safety Authority panel on dietetic
products, nutrition, and allergies. Scientific opinion on dietary reference
values for vitamin D. EFSA J. 2016;14(10):4547.
**Saggese,
G.; et al. Ital J Pediatr 2018, 44, 51.
Abbreviations: Adequate Intake, AI;
Upper Level, UL; International Unit, IU.
Specification:
1 IU is equal to 0.025 µg of vitamin D