Check for the "use by" date on the packaging of Dicalcium Phosphate when buying as a supplement.
Dicalcium Phosphate may turn out to be a skin irritant and dry out and break down skin cells. It may also cause feelings of nausea.(2)
(1,2) https://www.livestrong.com/article/472086-what-is-the-purpose-of-dicalcium-phosphate/
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NutriBuddy™ 
Description
Dicalcium Phosphate is the calcium phosphate with its dihydrate. It is approximately 23% calcium. It is produced by the neutralization of calcium hydroxide with phosphoric acid.