Nutridom 缓释维生素 C 1,000 毫克（120 粒胶囊）加拿大制造，高品质，增强免疫系统，支持胶原蛋白生成，增强皮肤健康，作为抗氧化剂，支持心血管健康

Time release vitamin C uses a sustained release matrix (typically hydroxypropyl methylcellulose) that gradually releases ascorbic acid over several hours rather than all at once. This maintains more consistent blood levels of vitamin C throughout the day, reduces the peak concentration that triggers urinary excretion of excess vitamin C, and may be gentler on the stomach than immediate release high dose vitamin C. A single daily capsule provides sustained support throughout the day.

Vitamin C (ascorbic acid) is an essential water soluble vitamin with multiple roles: it supports immune function by supporting white blood cell production and function, acts as a potent water soluble antioxidant neutralizing free radicals, is a required cofactor for collagen synthesis enzymes, enhances non-heme iron absorption from plant based foods, and supports skin, cartilage, bone, gum, and blood vessel integrity. The body cannot produce or store vitamin C, making consistent daily intake essential.

The recommended dietary allowance for vitamin C is 75–90mg per day for adults, but higher doses of 500–1000mg are commonly used for immune support, antioxidant protection, and collagen synthesis. At high doses, intestinal absorption becomes partially saturated and excess is excreted in urine time release delivery reduces this urinary loss by spreading absorption over several hours. Consult a healthcare practitioner to determine the dose appropriate for your individual needs

For high dose vitamin C supplementation (500–1000mg), time release delivery offers advantages over immediate release: more consistent blood levels throughout the day, reduced urinary excretion of excess vitamin C, and reduced likelihood of digestive discomfort. For lower doses (under 200mg), the difference is less significant as absorption is not saturated. Time release is particularly relevant for those taking 1000mg per day who want sustained support from a single daily capsule.

Vitamin C accumulates in immune cells particularly neutrophils, lymphocytes, and phagocytes at concentrations many times higher than in plasma. It supports the production and function of these white blood cells, supports skin and mucous membrane barrier integrity as the body's first line of defense, and is rapidly consumed during immune responses. Consistent daily supplementation helps maintain adequate vitamin C levels to support immune readiness.

Vitamin C is a required cofactor for prolyl hydroxylase and lysyl hydroxylase the enzymes that stabilize the collagen triple helix structure. Without adequate vitamin C, the body cannot produce stable, functional collagen. Collagen is the most abundant structural protein in the body, providing integrity to skin, cartilage, bone, gums, tendons, and blood vessel walls. Consistent daily vitamin C intake is essential for ongoing collagen production and tissue maintenance.

Yes. Vitamin C enhances the absorption of non heme iron the form of iron found in plant-based foods such as legumes, grains, and leafy greens. Vitamin C reduces ferric iron (Fe³⁺) to ferrous iron (Fe²⁺), the form more readily absorbed in the small intestine. Taking vitamin C alongside iron-rich plant foods or iron supplements can meaningfully improve iron absorption. Consult a healthcare practitioner if you have an iron overload disorder before supplementing with vitamin C.

Yes. Ascorbic acid produced by fermentation of glucose is chemically identical to the vitamin C found naturally in fruits and vegetables. The body cannot distinguish between synthetic and natural ascorbic acid they have the same molecular structure, the same biological activity, and the same bioavailability. "Natural" vitamin C from food sources such as acerola cherry contains ascorbic acid alongside bioflavonoids, but the ascorbic acid itself is chemically identical.