# How to add phosphate ions in the gromacs

**URL:** <https://gromacs.bioexcel.eu/t/how-to-add-phosphate-ions-in-the-gromacs/852>\
**Category:** User discussions\
**Created:** [September 22, 2020, 10:43am UTC](https://gromacs.bioexcel.eu/t/how-to-add-phosphate-ions-in-the-gromacs/852 "2020-09-22T10:43:29Z")\
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**Author:** ![jalemkul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/jalemkul/32/18_2.png) [@jalemkul](https://gromacs.bioexcel.eu/u/jalemkul)\
**Post date:** [September 22, 2020, 6:27pm UTC](https://gromacs.bioexcel.eu/t/how-to-add-phosphate-ions-in-the-gromacs/852/2 "2020-09-22T18:27:30Z")

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Polyatomic species can be inserted with `gmx insert-molecules`, provided you have a coordinate file for whatever it is you need. Most experiments are conducted at such low concentration of such species that you will only get a few molecules in the simulation and their effects are irrelevant.

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