Available in 2C-30C, 200C, 4X-30X, 1M-10M from $6.59
HPUS indication of Phosphoricum Acidum: Headache
Below are the main rubriks (i.e strongest indications or symptoms) of Acid Phos in traditional homeopathic usage, not approved by the FDA.
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Glacial phosphoric acid. Hahnemann. HPO3