Vitamin D/K2 Liquid

Name: Vitamin D/K2 Liquid
Brand: Thorne

PFR Grade

Excellent — minimal plastic, transparent materials, safe for daily use

NSF Certified for Sport. No artificial colors, no titanium dioxide, no synthetic additives. Thorne is one of the most trusted supplement brands for quality and purity.

PFR Approved

Vitamin D/K2 liquid supplement. NSF Certified for Sport. No artificial colors, no titanium dioxide, no synthetic additives.

Score Breakdown

How scores are calculated

Materials (40%): How plastic-free the product is — raw materials, construction, and coatings.

Packaging (20%): Is the product packaged in plastic? Is it recyclable?

Transparency (20%): Does the brand disclose ingredients, sourcing, and manufacturing?

Durability (20%): How long does it last? Longer-lasting products reduce plastic waste over time.

Materials

Packaging

Transparency

Durability

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Last updated: April 6, 2026

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Low Exposure Risk — Why This Product Category Matters

Supplement capsules and tablets often contain microcrystalline cellulose, titanium dioxide (a possible carcinogen), artificial colors, and other synthetic additives. Plastic supplement bottles are made from HDPE or PET plastic. The supplement industry is less regulated than pharmaceuticals.

Why We Recommend This Product

Thorne's Vitamin D/K2 is NSF Certified for Sport — one of the most rigorous third-party certifications. No artificial colors, no titanium dioxide. Liquid format avoids capsule fillers entirely.