In general, the efficacy of most supplements is debatable. If you actually read the documentation on most of them, you'll notice that they're rather vague on what they actually DO. In many cases, they have absolutely no scientific evidence to suggest they actually do what they claim, so they leave their claims to vague phrases like "digestive health" or "joint health". There are also concerns about the safety of them if they did work (e.g., a supplement that claims to increase breast size and actually does? What the hell is it doing to your body to do that?)

The only supplements with any real evidence are the micronutrient ones (i.e., "vitamins") and only if you have a specific deficiency (e.g., calcium supplements for someone who's severely lactose intolerant).

Tldr, most supplements are at best useless or at worse harmful.

Yes, just as you technically can watch a 3D movie with both eyes open, but also:
No, not unless you switch your hand back and forth between your eyes REALLY fast (like, at least, 60 times a second), or blink that fast.

If you cover one eye, and have the other one open, you'll still see the two different images, flickering between them. It will basically look blurry. The key point is that the glasses switches back and forth between the eyes, in sync with the projector/TV switching the two images.

It's basically this effect: https://i.stack.imgur.com/CGbUh.gif, but much faster (and a video, with moving subjects, etc)

Your blood pH should be in a specific range. CO2 dissolved in your blood makes it more acidic. When you hyperventilate, the concentration of CO2 in your blood drops. When you breathe into a paper bag, you inhale more CO2 than you would just breathing air from outside the bag, and it helps compensate for the extra CO2 you're exhaling.

OP asking the right questions. The main effect of oral collagen supplements is that they can build healthy, full, and radiant portfolios for the supplement makers. The "glow" of having money is very noticeable.

so technically I can watch a 3D movie with no 3D glasses if I cover one eye right?

It is still “extra protein” so if that’s something you think your dad could use, like if he has a crap diet, in that sense it’s a good thing. He could also take whey protein (which is cheaper, but some people have digestive issues with it), egg protein, pea protein… each of these has different qualities in terms of cost, slight flavor, digestibility, water-solubility, whether it can be cooked/baked, etc. Protein is important (especially in aging folks) so keeping the intake high is beneficial. The fact that it’s specifically collagen-derived, or whey, or egg, etc. is mostly irrelevant.

Besides polarization (like mentioned in other answers) there is another technique (albeit it might not be as commonly used today): Active Shutter 3D system.

These glasses is, usually, a lot bigger, and needs batteries. They work by blocking one eye (like an eye patch), and then quickly switching to the other eye. The glasses do this really quickly. And at the same time the projector (or TV) shows one image for say the right eye, and then quickly changes to an image for the left eye. The TV/projector sends a signal to the glasses so the glasses switches eye at the same time as the TV/projector.

The difference between the two images is that one taken a little to the side to the other. Where the right image might show a little more of the right side of an object, and vice versa, this gives a perspective effect. And since this is how our eyes work, and how we perceive depth, you perceive the things on screen to have a depth to them.

Aha believe it or not, it's my dad, I'm just tryna save the guy some money, I had a feeling it was snake oil (hence my question), I just wanted to know if I was correct or not

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This may not quite be eil5 level, but

You remember old 3d movies with the red and blue images? The way those worked is when you wear the red and blue lens would block one image per eye. So the red lens blocks the blue image, and the blue lens blocks the red image.

This in turn emulates how you actually see in 3d where each eye sees separate images.

Newer 3d movies work on the same principle, but instead of using colors to do it, it actually uses polarities of light. So when you look at the screen without the lenses it looks distorted and blurry because you're seeing 2 images. The glasses block one image per eye depending on the polarity. This allows you to still see all the colors too compared to the red and blue method.

Your eyes perceive depth by comparing the difference between the two "pictures" your eye takes. 3-d glasses replicate this by tricking your eyes into each seeing a different image projected onto the same screen

The old red/blue ones used red and blue light to replicate this (red light only went through the red lens, blue through the blue one).

Nowadays the RealD glasses (the clear ones) make use of light polarization, which is the direction the wave of light wobbles as it travels (like a sine wave from trigonometry class). One lens only lets light wobbling horizontally pass through, the other only lets the vertically wobbling light pass through.

Fun tricks with those RealD glasses next time you have a couple pairs: 1. Take a look at your friend wearing one and close one eye, one of their lenses should turn black and 2. Keeping one eye closed and looking at your friend wearing a pair, tilt your head and you should see the lenses change

To fix the edit: it looks distorted without the glasses because both eyes are seeing both images since our eyes can't detect polarization

Lucky OP!

Today is the day that you get to learn about the fact that dietary supplements are not required to have any evidence to back up their claims. They're not regulated that way, like medicines are.

They make it so that each eye sees a different image. When you look without the glasses, you see both images with both eyes, instead of one image for each eye. The light intended for each eye has different polarity, and the glasses are polarized in different directions to block the light intended for the other eye.

to clarify my question: how is it that 3D movies look so distorted but when you use the glasses you can see it well. what do the glasses do exactly to make that happen?

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It doesn’t do anything, and it also doesn’t do anything if you put it on your skin in the form of a lotion. It’s a marketing gimmick. It might definitely contain the ingredient! But it doesn’t actually do anything, it just sits there. People just know it’s a primary reason for youthful-looking skin, so if a supplement or lotion contains it, it must be extra-good for your skin.

Thats an important thing, it doesn't. Evidence doesnt back it up and neither do Biological mechanisms.

Some will argue that youre ingesting the exact nutrients you need to produce it, but that's exactly the same situation as ingesting other common proteins and in colagen production, the limiting and regulating factors are not availability of nutrients mainly

Collagen is definitely not absorbed to the bloodstream

Collagen supplements usually don't have all the wonderful benefits people claim. You are correct that it will mostly be broken down into component parts before reaching the blood stream. It might have the benefit of having nearly the same ratio as what the body may need to synth it, but whether that matters much if you get sufficient general dietary protein is probably not all that likely.

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I have young children who have had a bunch of ear infections which results in high fevers. You get a different answer from every medical professional. Some say let the fever go if its not too high, some say use Tylenol to reduce the fever. Its all over the place.

It ran a mean 100m dash back in middle school, though.

That refers to collagen that has already been partially broken down so it is easier for us to digest.

The good thing about it is it gives us exactly the peptides we need to build our own collagen. But we do still have to break it down and rebuild it ourselves.

One thing to keep in mind though is that we don't actually replace our collagen that much at all. Unless you go through special procedures to make it happen, like what we are starting to see with regenerative medicine, you are not going to get much effect.

I was hoping that someone posted it as soon as I saw the post well done ahha

As a patient I always ask if I can take paracetamol or a stomach protector with ibuprofen, because I can't handle ibuprofen more than 2 days without it damaging my stomach. But I was told that its better for inflamations