Yes, soy candles are safe to burn indoors. They are typically made from natural ingredients, produce less soot compared to paraffin candles and do not release harmful toxins into the air when burned. However, like all candles, they should be used with caution.
This includes trimming the wick before each use, burning candles in a draft-free area, never leaving candles unattended and placing them on a sturdy, heat-resistant surface away from flammable objects.