Chondroitin sulfate for vocal flexibility in singers

I've been hesitant to post about this because only two people, my sister and myself, have tried it. But she is a voice teacher, so she's generally reliable on issues of vocal performance. Around the beginning of 2018, she asked me whether there was anything she could do to help her lungs not hyper-react to the grooming products used by a student. So I looked into it for her and suggested that she try chondroitin sulfate since it seems important to building healthy support structures for the surfaces of the trachea and bronchi.

She took chondroitin sulfate for a couple of weeks, and the bronchial hyperreactivity to her student's products went away. But even better--at least for a singer--her vocal range extended noticeably. So I tried chondroitin sulfate, too, and noticed that it helped me sing more easily and with a clearer tone. I find I get a noticeable result in my singing voice even if I take it only once in a while; the effect seems to kick in within a couple of hours.

The vocal cords (or folds) are supported by cartilage, and chondroitin sulfate is an important component of cartilage. Also, chondroitin sulfate has been found in the cover, ligament, and interstitial cells of the vocal folds (see http://journals.sagepub.com/doi/10.1177/000348949610500102 and https://www.sciencedirect.com/science/article/pii/S1808869416301045). One or both of these things could contribute to the mechanism by which she and I are finding that chondroitin sulfate helps us sing better. I'd love to hear if anyone else has noticed similar vocal performance effects in themselves after taking chondroitin sulfate.