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Rosehip also called rose haw and rose hep, it is the accessory fruit of the rose plant which are particularly high in Vitamin C. These are one of the richest plant sources in Vitamin C available. It has a wide range of L-Ascorbic Acid (Vitamin C) content, ranging from 0.03 to 1.3%. Rosehip contain Carotenoids, Beta Carotene, Lutein, Zeaxanthin and Lycopene ⁽¹⁾.

Vitamin C, also known as Ascorbic Acid and L-Ascorbic Acid, is a Vitamin found in food and used as a dietary supplement. As a supplement it is used to treat and prevent scurvy.  Vitamin C is an essential nutrient involved in the repair of tissue. Vitamin C including ascorbic acid and its salts, and some oxidised forms of the molecule like Dehydroascorbic Acid. Vitamin C is a cofactor in at least eight enzymatic reactions, including several collagen synthesis reactions that, when dysfunctional, cause the most severe symptoms of scurvy. Ascorbate also acts as an antioxidant, protecting against oxidative stress ⁽²⁾.

In humans, Vitamin C is essential to a healthy diet as well as being a highly effective antioxidant, acting to lessen oxidative stress. Life On Rosehip Vit C-Life has ascorbic acid which has the highest measurable amount of biological activity when taken through supplement.

Vitamin C plays an important role in protecting against Heart Disease it is helpful for preventing heart attack or stroke are mixed. Vitamin C doesn't lower cholesterol levels or reduce the overall risk of heart attack. vitamin C can slow down the progression of atherosclerosis (hardening of the arteries). It helps prevent damage to LDL ("bad") cholesterol, which then builds up as plaque in the arteries and can cause heart attack ⁽⁴⁾.

Vitamin C plays an important role in lowering risk of high blood pressure than people who have poorer diets. Eating foods rich in vitamin C is important for your overall health, especially if you are at risk for high blood pressure ⁽⁴⁾.

Vitamin C is essential for the body to make collagen, which is part of normal cartilage. Cartilage is destroyed in osteoarthritis (OA), putting pressure on bones and joints Antioxidants such as vitamin C appear to limit the damage caused by free radicals. Involved in the destruction of cartilage ⁽⁴⁾.

Vitamin C (500 mg) appears to work with other antioxidants, including zinc (80 mg), beta-carotene (15 mg) and vitamin E (400 IU) to protect the eyes against developing macular degeneration (AMD), the leading cause of legal blindness in people ⁽⁴⁾.
Vitamin C along with vitamin E may help prevent pre-eclampsia in women who are at high risk. Pre-eclampsia, characterised by high blood pressure and too much protein in the urine, is a common cause of premature births ⁽⁴⁾.

Vitamin C also helps in Boosting immunity, maintaining healthy gums Improving vision for those with uveitis (an inflammation of the middle part of the eye) Treating allergy-related conditions, such as asthma, eczema and hay fever (called allergic rhinitis) ⁽⁴⁾.

References
1.https://en.wikipedia.org/wiki/Rose_hip
2.https://en.wikipedia.org/wiki/Vitamin_C
3.http://journals.sagepub.com/ doi/ abs/ 10.1177/1533210110392951
4.http://umm.edu/ health/ medical/ altmed/ supplement/ vitamin-c-ascorbic-acid