This supplement comes from the ripe berries of the European elder tree (*Sambucus nigra*), not elderflower. The extract packs high levels of anthocyanins, compounds linked to immune health. Many people take it to reinforce the body's natural defenses, especially when respiratory viruses circulate.
You can take elderberry as soon as you feel a cold starting, or use it daily during winter months. Syrups are the most common form, but capsules, gummies, and lozenges are also available. To aid absorption, manufacturers often make extracts using water or alcohol to concentrate the active constituents.
Raw or unripe elderberries contain toxins, so only use processed products. Because elderberry can stimulate immune activity, people on immunosuppressants or with autoimmune conditions should consult a healthcare provider before use. Safety in pregnancy and lactation hasn't been established. Stop taking it if digestive upset develops.