Beetle powder and method for raising beetles comprising an ultraviolet treatment for preparing such a powder

A method for rearing beetles for preparing a beetle powder comprising:

• selecting beetle larvae of a beetle species from a group including Tenebrio molitor and Alphilobus diaperinus;
• increasing a nutritional value of the beetle larvae and resulting beetle powder, having a percentage by weight greater than or equal to at least 0.000010% in vitamin D3, by:
• applying a light treatment phase during which a UV source emits ultraviolet rays of UVA type having electromagnetic radiation with wavelength between 320 nm and 400 nm towards beetle larvae;
• limiting a treatment duration of the light treatment phase between one and six weeks;
• and
• limiting a heat applied on the beetle larvae based on a position of the UV source relative to the beetle larvae and a radiation power, between 13 and 125 Watts, of the UV source.