B-17? Sounds like a vitamin.
It is so considered by some: Laetrile. Found in apricot and apple seeds.
The FDA does not recognize. Used in Mexico as anti-carcinogenic alternative treatment.
If there is no genuine deficiency disease associated with its lack, then it is not legitimately a vitamin. However, that is a separate consideration from whether its presence has salutary effect.
Since such seeds are also high in cyanotic compounds, they can be dangerous in large doses.
Not prescribing, just informing.