Vitamin D from sunshine like dariodrl has indicated or a quality supplement. During the winter months I prefer taking Vitashine Vitamin D3 after experimenting with many toxic Vitamin D supplements on the market, mainly due to inconsistent dosages per pill.

Sufficient Omega 6 fatty acids to produce PGE2. Search: thermogenesis pge2

Hulled sesame seeds, quality in season raw pistachios, and fresh non-oxidzed in shell walnuts being my go to sources for Omega 6's.