The ordinary vitamin C suspension 30% in silicon is a think vitamin C cream with a smooth formula that targets thd signs of aging,including dull, lackluster skin and uneven skin tone.
The Suspension* contains a high 30% concentration of pure vitamin C. The suspension is water free, so it is more stable than water based vitamin C serums.
The vitamin C is in a base of extra light silicone, which gives it a smooth texture and feel on the skin.
But since the concentration is so high,  it can cause tingling or irritation, especially if you have sensitive skin.
*Suspension is a name for a skincare product that contains active ingredients suspended in a liquid,gel, or cream-like base.