"Is it safe?" is the most common question we hear about titanium drinkware. It is a fair question, so here is what titanium is and why it is used for food and medical products.
Commercially pure titanium
Titanium used for cups is usually commercially pure titanium, graded by small differences in oxygen and iron content. It is not an alloy mixed with other heavy metals. It is used in dental implants, joint replacements and surgical tools because it is biocompatible, meaning the body does not react badly to it.
Why it doesn't leach
Titanium protects itself with a stable oxide layer. This layer does not dissolve in normal drinks, including acidic coffee, fruit juice and lemon water. That is why titanium cups do not rust and do not give a metallic taste.
What about the colors?
Heat-tinted colors are simply a thicker version of the same titanium oxide. No paint, dye or plating is involved. Painted or coated cups are a different story; always ask what a colored cup is finished with.
Other parts of the cup
A cup is more than its body. Lids are usually made from plastic and silicone. Look for BPA-free, food-grade materials such as Tritan for the lid and food-grade silicone for seals, and avoid putting these parts over direct heat.
Bottom line
Pure titanium is one of the most inert and well-studied materials used in contact with the human body. For daily tea, coffee and water, it is a safe and long-lasting choice when combined with food-grade lid materials.
This article is for general information and is not medical advice.