AdvancedU ratings for supplements, quality and use

Vitamin C acts as an antioxidant • Contributes to the normal functioning of the immune system • Supports collagen formation for the normal function of skin, bones, cartilage, gums and teeth • Increases the absorption of iron from plant-based sources • Contributes to reducing tiredness and fatigue • The addition of a citrus bioflavonoid complex (100 mg) and rutin (25 mg) is among the best research-backed combinations in this product category for potentially improved cellular uptake of vitamin C (Calder et al., 2025) • The capsule (hypromellose) and excipients are plant-derived, making the product suitable for vegans and vegetarians

The largest package in this product category (365 tablets) - almost a year's supply in a single purchase • Contains methylcobalamin, an already biologically active form of vitamin B12, at a dose of 500 µg, which falls within the upper part of the clinically meaningful range (Eussen et al., 2005) • The most affordable price per individual daily dose among the compared products in this category

Contains iron bisglycinate – a chelated form with high bioavailability and generally fewer digestive issues than cheaper salt forms (Milman et al., 2014) • Clearly stated dosage (20 mg of elemental iron per capsule) • Affordable price given the 60 capsules per package • Short ingredient list with no unnecessary additives

Contains MCT oil as a carrier, which supports the absorption of fat-soluble vitamin D3 • The formula includes an added antioxidant (alpha-tocopherol/tocopherols) that protects vitamin D from oxidation • Among the lowest prices per capsule in this product category • Clear, specific warning for people with high blood pressure or kidney stones – rare among comparable products

Contributes to the maintenance of normal blood calcium and phosphorus levels and normal absorption of both minerals • Contributes to the maintenance and development of healthy bones and teeth • Supports the normal function of the immune system • Maintains normal muscle function • Gluten-free

Vegan HPMC capsule without gelatin – one of only two clearly vegan formulas in this product group • The 3000 IU dose falls within the clinically relevant range for maintaining vitamin D status • Based on the listed ingredients, free from gluten and lactose

High dose of 4000 IU (100 µg) in just one capsule per day • Vegan capsule, also suitable for a plant-based diet • Contributes to the normal function of the immune system and the maintenance of healthy bones and teeth • Contributes to normal absorption of calcium • Favorable price for a 90-day supply (€9.99 for 90 capsules)

Combination of D3 and K2 in one product – combined intake, according to some studies, better supports bone quality than D3 alone (Kuang et al., 2020) • Contributes to the maintenance of healthy bones and teeth • Contributes to the normal function of the immune system • Gluten- and lactose-free • Dosing every other day is convenient for those who find it hard to stick to a daily routine

Contributes to normal absorption of calcium and phosphorus • Contributes to normal levels of calcium in the blood • Maintains healthy bones and teeth • Helps support the function of muscles and the immune system • Minimalist formula with just two ingredients – sunflower oil and cholecalciferol • Vitamin D3 is dissolved in oil, which supports the absorption of this fat-soluble vitamin (Dawson-Hughes et al., 2015)

Contributes to the maintenance of healthy bones and muscle function • Contributes to the normal function of the immune system • Natural peppermint flavor • Gluten-free and lactose-free • A dose of 4000 IU per day reaches the upper end of the clinically used range for correcting deficiency

Gluten-free and lactose-free • Contributes to the normal function of the immune system and the maintenance of healthy bones • Pleasant natural lemon, orange and propolis flavor – without the bitter aftertaste that plain oil drops can have • Low, moderate dose suitable for long-term daily use without approaching the upper safe limit