| CPC A61K 9/1272 (2013.01) [A61K 9/0078 (2013.01); A61K 31/7105 (2013.01)] | 17 Claims |

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1. A nanoparticle comprising:
from 30 mol % to 65 mol % of an ionizable lipid;
from 30 mol % to 60 mol % of β-sitosterol;
from 5 mol % to 20 mol % of a structural lipid; and
from 3.5 mol % to 4.5 mol % of a PEG lipid;
in amounts relative to each other.
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