Turmeric can be used as a mild anti-depressant. It worked pretty well for me for a good long while. Turmeric powder has to be combined with black pepper and a healthy fat (like coconut, olive, or hemp oils), and kind of needs to be heated to a warm temperature for it to be bio-available. I got lazy when taking turmeric, and just started jamming the raw root, a splash of pepper, and a teaspoon of oil in my mouth, masticating it around for a few minutes, then swallowed. I love cooking with turmeric too! This concoction can also help with aches and pains, as it is an anti-inflammatory, but be careful. Turmeric is also a really good anti-coagulant, so do research if you are prone to bleeding or on blood thinners. I was using turmeric for all its purposes and was able to stay off clot-busters, A/D, painkillers, and it even did wonders for my cholesterol levels and blood sugars/A1C.
As with any natural food-based remedy, its better to ingest the whole food, not just the extract, due to the synergistic nature of compounds in the foods. Its ALL the parts working together in their natural ratio's that make healing happen. :-)
Something very easy has sprung into my path as a natural anti-depressant: juice of half a lemon in a big glass of water, first thing in the morning on an empty stomach. It's like drinking sunshine. Effects are cumulative, so you may not feel effects immediately, but after a week or two, you'll know if you miss a day!