Milk tea does contain caffeine since it's made with regular tea, like black or green tea. The amount of caffeine can vary depending on how you brew it. The milk adds a nice creamy touch, but the caffeine is still there to give you a little pick-me-up!
https://litefacts.com/does-milk-tea-have-caffeine/

Yes, milk tea has caffeine because it's made with tea leaves like black or green tea. The amount of caffeine depends on how strong the tea is brewed. Adding milk makes it smooth and creamy but doesn’t reduce the caffeine. So, it's a tasty option with a little energy boost!
https://litefacts.com/does-milk-tea-have-caffeine/

Vitamin B12 deficiency may, in rare cases, be associated with certain types of cancer. A deficiency in this vitamin can lead to symptoms like fatigue, weakness, and nerve problems. While not a definitive sign of cancer, low B12 levels should be investigated to rule out serious health concerns. Early detection and treatment of B12 deficiency are essential for maintaining overall health.