Blueberries are best eaten fresh
Blueberries strengthen immunity and protect the body from evil diseases and rejuvenate because they are a superior antioxidant. Blueberries are best picked in deep forest in ecologically clean regions. This shrubby plant of aromatic fruits of blue-blue color in conditions of harsh climate has even bigger, more useful and stronger beans. Fresh fruits are consumed during the summer, while dried and frozen products are consumed during the winter. However, blueberry tea can be drunk throughout the year. Fresh blueberries provide the maximum amount of vitamins and minerals. Most of the nutrients are stored in dry form, but it is important to pick fully ripe fruits during July and August and to dry them properly. Blueberries can be frozen immediately after picking but do not wash them. Blueberry leaves are collected during May and June during the flowering period. Blueberries are best picked in the morning and evening. Do not pour the fruit from one container to another, as the skin is very sensitive and can be damaged, so the fruit spoils faster. Useful properties are most manifested in fresh form then in the form of juice and porridge mixture of blueberries and sugar in a ratio of 1: 1. Heat-treated fruits lose most of their useful properties. Blueberries should be blue-blue with a gray patina and not abnormal in size. Forest blueberries are the healthiest and slightly smaller with a strong aroma and intense blue-violet color.
The strongest weapon of blueberries is the anthocyanin-pigment of red-blue color. This antioxidant has been shown to be helpful in fighting cancer. At the cellular level, it prevents the appearance of all types of tumors, regardless of the cause. These substances are found in apples, black grapes, red cabbage in smaller quantities compared to blueberries. Blueberry leaves are used to make tea. Tea is a good anti-inflammatory agent because it alleviates all types of inflammatory conditions. It also has an antibacterial effect. This tea is a natural diuretic. If you suffer from high blood pressure or want to lose excess weight and get rid of excess fluid, then blueberry leaf tea is a great choice. Blueberries are a good choice for preserving eyesight due to the abundance of vitamin C, tannins and flavonoids. Regular consumption of blueberries has a beneficial effect on retinal blood vessels, which nourishes and refreshes. In small capillaries, it restores blood flow to normal and thus removes fatigue and tension in the eyes and sharp vision. In folk medicine, blueberries are used for therapeutic and preventive purposes due to diarrhea, disorders of the gastrointestinal tract because they are excellent for the intestines and stomach, inflammatory conditions of internal organs, urinary tract diseases, rheumatic fever, pharyngitis and angina. They are extremely useful for strengthening the complete blood count, so they are recommended against anemia. Fresh blueberries and tea and medicinal liquid from the leaves are useful against ulcers, burns and other skin diseases. Blueberry leaves are used to improve the vascular picture due to eye diseases and poor eye vision.
Blueberries have the ability to store all substances from the environment, including radioactive, heavy metals and toxic substances. Therefore, the use of fruits and leaves is recommended only if the blueberries grow in a clean, safe and unpolluted area or intact deep forest.

https://www.walmart.com/ip/Smucker-s-Blueberry-Preserves-18-Ounces/15754270