Natural does not mean suitable for every person or every use. Safety depends on botanical identity, product concentration and intended application, which should be assessed separately.
Similar names do not identify the same plant
Kew distinguishes culinary Laurus nobilis from poisonous plants such as Prunus laurocerasus that share related common names. Do not prepare food or drinks from unidentified leaves; ask the supplier for the botanical name.
Oil is not a dried leaf
Essential oils can cause harm when swallowed or applied incorrectly. Keep them away from children and follow the label. After an exposure or symptoms, seek advice from a local poison centre or health service instead of trying a homemade antidote.
Source: Poison Control — essential oils
Regular use for health purposes
Do not replace diabetes medicine with herbal products. Medication use, pregnancy, breastfeeding and use by children require individual assessment that this article cannot provide. Discuss suitability with a clinician; no safe treatment dose or routine tea course is established here.