To be simple, no, TikTok is not a reliable source for most information. There are a few creators that can be honest and truthful, but at the end of the day, most of the information on the app is purely for entertainment and engagement. According to https://www.captechu.edu/blog/tiktok-and-war-misinformation, when people first interact with fake news, they are more likely (due to the algorithm) to see more fake news. This then starts a cycle of constant misinformation being fed to users. Some examples of this from the website are: "In 2020, a video falsely claimed that consuming garlic could prevent COVID-19, leading to widespread sharing despite a lack of scientific evidence. In 2021, another video falsely claimed that COVID-19 vaccines were magnetic, causing some individuals to question and even refuse vaccination. And scores of videos have created and amplified claims that 5G technology causes cancer."
Claims like this can cause not just the spread of misinformation but also harm to the people being fed this information. A study from https://pmc.ncbi.nlm.nih.gov/articles/PMC11150891/?utm was conducted on health information on TikTok being seen by young women. The study shows that TikTok is a significant source of health information—65.5% intentionally seek it and 92.4% encounter it unintentionally. While 98.2% believed misinformation on TikTok was prevalent, many perceived others to be more susceptible than themselves.
A study from the University of Chicago states that roughly 50% of TikTok health-related videos contain misleading or false claims. https://biologicalsciences.uchicago.edu/news/health-information-tiktok?utm_
At the end of the day, I do not think that TikTok is a reliable source for information, and claims that you see should not be taken to heart if they are not backed by a reliable source.