[Product Question] Which Vitamin C serum on the market is lab tested for potency?

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I have been using vitamin C serums for many years to battle acne and scarring (male) and I'm looking to purchase a bottle but how do we really know that the product's for sale actually contain the gazillion ingredients that they list? One particular product I'm looking at includes astaxanthin, retinols, q10, etc. How the hell would I know if they're just bullshitting me? What products are actually tested?
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Submitted by catogenics