I used to drink Lambanog when we relocated to the Philippines. At that time it was 100% natural and did not contain any artificial chemicals.
Things have changed in the past few years and most of the Lambanog/Tuba you see for sale on the roadside, is not pure. They mix a small amount of pure wine (for taste) with water and some chemical. Its tastes similar but it must be affecting peoples internal organs even more than the original

Last time I was up North I bought a bottle of Dragon Fruit wine Will definitely get a few more bottles the next time.

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