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In addition, the use of zinc-based pesticides and fertilizers in agriculture can increase the zinc content in the soil, further exacerbating the problem of zinc excess in the environment and in animals that rely on these contaminated resources [152]
The current guidelines for dosage are: 400 IU for infants 0-12 months 600 IU for children and adults 1-70 years old 800 IU for people older than 70 Many vitamin D supplements on the market can exceed the recommended dosage, some even containing up to 5,000 IU per pill
Stress, environmental pollutants, and poor nutrition can also deplete your levels
An early small clinical study by Tamura et al