4-.17 fl.ounce samples and 1 .067 fl.oz sample.Brighten and firm your complexion with this innovative vitamin C serum from Augustinus Bader. The gentle formula reduces dullness and dark spots without causing irritation. • WHAT IT IS: • A first of its kind Vitamin C serum - clinically proven to brighten, firm, and protect, without irritation. Powered by Advanced TFC8® to unlock the full potential of stable, gentle Vitamin C • WHAT IT DOES: • Advanced TFC8® boosts renewal and formula efficacy, unlocking gentle Vitamin C's brightening power without irritation. Reduces dullness, dark spots, and uneven tone, firms, smooths lines, hydrates, and helps defend against UVA and pollution damage.