The investigators want to investigate if HIV sero-positive males benefit from vitamin D supplementation. The study runs in 16 weeks and the participants are treated with one of three placebo controlled regimes (tablets): 1. Calcium 2. Calcium and 25-hydroxy-vitamin D 3. Calcium and 25-hydroxy-vitamin D and 1,25-dihydroxyvitamin D The endpoints are: * Serum vitamin D * Parathyroid hormone * ionized calcium * T-lymphocyte fractions (naïve, mature, Tregs) * Osteocalcin (bone metabolism)
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serum-vitamin D metabolites
Timeframe: week 0
serum-vitamin D metabolites
Timeframe: week 2
serum-vitamin D metabolites
Timeframe: week 4
serum-vitamin D metabolites
Timeframe: week 8
serum-vitamin D metabolites
Timeframe: week 12
serum-vitamin D metabolites
Timeframe: week 16