Is ca/mg citrate/ascorbate an antacid

Hi,
I sometimes have to use Doxyxycline.

In drug interactions I read:
Absorption of tetracyclines is impaired by antacids containing
aluminum, calcium, or magnesium, and iron-containing preparations.

I use a multi with ca/mg citrates/aspartates/ascorbates.
Should I stop using the multi or are these ca/mg forms acid enough?

Bob
.

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