In Jainism, mushrooms are typically avoided. Reasons:

• They are fungi, not plants, and harvesting them can harm tiny life forms.
• The principle of ahimsa (non-violence) leads many Jains to avoid something that involves killing or harming microorganisms.

Most Digambar and Shwetambar community guidance discourage taking mushroom-based supplements. If you are considering any supplement, the usual Jain approach is:

• Prefer pure plant-based or mineral/vitamin sources that don’t involve harming growth or life forms.
• If in doubt, consult a trusted Jain scholar or your local Jain center for guidance specific to your tradition.

If you’d like, I can point you to Jain Knowledge resources on diet and ahimsa that discuss how to approach supplements within Jain principles.