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The benefits claim is that Hyaluronic Acid promotes healthy joints and connective tissue and enhances the health of the skin. What it does not mention is that Hyaluronic is very much part of your Vitreous system in your eye. Vitreous fluid (google it!) is the clear "water" substrate that fills your eyeball and it is composed of a small amount of Hyaluronic Acid and mostly Water bound to it. The two are ensconced between thin curtains of collagen to keep the conjugate in proper place. All perfectly see-through from birth to death. Taking Hyaluronic can cause the Hyaluronic/Water conjugate to fall apart, releasing the Water, and leading to a condition called Posterior Vitreous Detachment. How do you know you got PVD? One day you wake up and there is a spider in your peripheral (if you're lucky) vision. Wherever your eye moves, the spider moves with it. You look to the extreme side to make it go away. You look straight, and it jumps back, right where it was before, driving you absolutely crazy. You will literally think your life is over, because this is our eyesight. The most precious of senses. The visual artifact can take a form of loose spider web, floating in the center line of your vision, which is much worse because ir interferes with anything you do. And if you get freaked and manipulate your eye, pressing hard here and there to somehow dislodge this, you will make the situation much much worse. You will create more artifacts, more spider webs, and on top of it, you will start having flashes every time your eye moves up, down or to the sides. You can see the flashes only at night, when you drive, for example, as you flick your eyes to one of the three mirrors and back. Very unpleasant and disrupting. It's literally like a lightning in your eye. Back to the PVD: (watch when googling PVD, you'll end up googling Peripheral Vascular Disease with the same acronym as Posterior Vitreous Detachment). The artifacts in your vision are caused by scarps of contracted collagen, formed by the action of Hyaluronic/Water decoupling, with Water no longer held in check and released by Hyaluronic. That creates an air bubble at the retina side of the eye (thus posterior). The scraps are referred to as floaters. They are the ones responsible for the spiders and webbing as they cast shadows on your retina. You don't see these artifacts when watching TV at night (thank god) because there isn't enough light for the floaters to cast the shadows. You definitely see them daytime, particularly in white-painted rooms. A bit less in strong sunlight. There is no treatment for PVD. You own it. Your MD will tell you that. They'll say, get used to it. That's the treatment. You can go to church and pray to make it go away. The flashing disappears over time, about 6 months, as long as you're nice to your eye(s) and don't rub too hard. The spider in my peripheral vision is still hanging on along with some webbing. The flashing is almost gone, exactly 6 months to the day I was diagnosed and messed with my eye as described above. Once again, be super gentle with your eye if you take Hyaluronic and end up with PVD. This is my personal experience with taking Hyaluronic Acid 300 mg for about 60 days from Dec 2019 to Feb 2020. I wish I could take that day I purchased this bottle of Hyaluronic back.