Cordyceps is generally considered safe for most people. However, it may have blood-thinning effects, so those taking anticoagulant or antiplatelet medications should use it with caution. People with autoimmune disorders should also be cautious as it may stimulate the immune system. As the supplement can lower blood sugar levels, diabetics should monitor their blood sugar closely. There is insufficient data on the effects of Cordyceps during pregnancy and breastfeeding, so it is advisable to avoid it during these periods. As always, it is recommended to consult a healthcare professional before starting any new supplement.