There are only a few conifers (pine, spruce or fir) oils that have a significant percentage of d-limonene in them. Siberian fir, Silver fir and Engelman Spruce are three that generally have at least 25% d-limonene. Why do you care about d-limonene? Well maybe you don’t but check this out…. Immune stimulating effects of d-limonene [...]
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