Here’s a video of how to make a tincture using Comfrey leaves.

Comfrey tincture is to be used topically, NOT orally. You can put it on your skin, on closed wounds (not open wounds), such as burns, scrapes, or acne blemishes. You can also use it in your face wash or put it into your bath water.

From Wikipedia:

“Contemporary herbalists have a mixed view of comfrey, despite widespread historical use. Its traditional names of knitbone, boneset and the derivation of its Latin name Symphytum (from the Greek symphis, meaning growing together of bones, and phyton, a plant), speak to its longstanding reputation as a therapeutic herb.[14][15] Comfrey was historically used to treat a wide variety of ailments ranging from bronchial problems, broken bones, sprains, arthritis, gastric and varicose ulcers, severe burns, acne and other skin conditions. It was reputed to have bone and teeth building properties in children, and have value in treating “many female disorders”.

The plant contains the small organic molecule allantoin, which is thought to stimulate cell growth and repair while also depressing inflammation.[16] Constituents of comfrey also include mucilage, steroidal saponins, tannins, pyrrolizidine alkaloids, inulin, and proteins.[17]

The flowers of Russian comfrey
In modern herbalism, comfrey is most commonly used topically. Some experts say that comfrey should be restricted to topical use, and should never be ingested, as it contains dangerous amounts of hepatotoxic pyrrolizidine alkaloids (PAs).[18][19] Studies associating comfrey with veno-occlusive disease (VOD), do not differentiate between Russian and common comfrey, plants with very different levels of PAs. VOD can in turn lead to liver failure, and comfrey has been implicated in at least one death, though the type of comfrey being consumed, and other dietary, physiological and pharmacodynamic factors were not accounted for.[20] In 2001, the United States Food and Drug Administration issued a ban of comfrey products marketed for internal use, and a warning label for those intended for external use.[21][22] In addition to restrictions on oral use, some experts recommend applying comfrey extracts no longer than 10 days in a row, and no more than 4–6 weeks a year.[16][23]”

https://en.wikipedia.org/wiki/Comfrey

Here’s a link for some amber glass dropper bottles: https://www.amazon.com/gp/product/B00V73OA6O?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00