I remember that a long time ago (more than ten years IIRC) that a company called Essential Organics was forced (by the FDA?) to drastically reduce the amount of vit. A in their "Mega Vites". The reason was that it was proven, also in animal tests, that large doses of vit. A could cause serious birth defects. I think that some people are very susceptible to vitamin A and that vitamin A causes wrong tissue formation somehow in those people. Vitamin A is essential for proper skin formation in all people, only perhaps in around 0.1% of people when they take too much - for them at least- it causes tissue malformation. Just a postulation of course. Everything has a cause and perhaps in some cases this is the cause. We need more data.
Self-promotion ahead.. About bent needles: All rollers are made in SE-Asia, and all rollers are relatively cheap to produce. Even the ones with LED lights, which are a useless gimmick, used to justify a ridiculous price. A roller subjected to rigorous quality control should cost not too much more than the worst rollers. The most expensive rollers are always a "scam" in that sense, because you pay through the nose for no reason. The cheapest rollers on eBay and Amazon are the bottom of the barrel, basically brand-less rollers that came from batches that failed QC sampling tests. We are not unscrupulous sales agents for any factory. We regularly buy new types of rollers,
test them and sell the ones that we know will give us the least customer support issues, the most sales due to optimal price/quality factor and hence the most positive word-of-mouth. We order our rollers directly from the factories in batches made for us. They start up production for us. Rollers are not automatically produced, they are hand-assembled! So it can take one month before we receive our order of 1000+ dermarollers. And we always make it clear that we expect quality or there will be no next order. This is how we can offer good quality for a good price. You can see that we started to sell a new type of roller. We're phasing out our old types. That's because we found a slightly better one. It is in our best interest to keep researching the market for the best value for money because our business model is all about filling the niche with the best quality for the lowest price for everything we sell. We don't even waste money on advertising. A good product sells itself through word of mouth. We compete on expertise, customer support and price/quality.
All dermarollers can theoretically get a needle or two bent when they arrive at your home. Ours too. However, at least with our rollers it's so rare that when a customer says: "My roller arrived with bent needles" we simply refund them without further questions (well, occasionally we may ask for a picture, for quality assurance reasons).
The needles should definitely not bend when you place the roller head-down in a glas jar! If you don't chuck it in with great force, it should be no problem.
Again about dermarolling companies: I can only speak for ourselves when I say that I am constantly researching micro-needling. I'm preparing an article about Hyaluronic acid at the moment. I am very sure that 99% of the other companies that sell dermarollers are scammers, basically. They are just PR-agencies attached to Chinese factories, or some young "search engine optimizers" interested in "making money online". They always advertise like crazy on Google. We don't need to - we use word of mouth. I haven't seen a single respectable company out there, it's all totally disinterested money-grubbers, promising the moon. If you know an exception, let me know. Even "Dr. Roller" only tries to keep up a respectable appearance to justify their inflated price. We sell the exact same roller for half the price. They are all sales companies, not skin experts or employing anybody even remotely interested in the skin. They have advertizing folks, forum SPAM folks and sales page design folks but skin folks are ominously absent, which becomes noticeable when you ask them a difficult "skin question". When I don't know the answer, I sometimes spend half a day on the net, hunting for a cross-verified, evidence-based answer. John spent hours, some weeks ago, in figuring out how to make rounded corners on our sales page, lol.. We came to the conclusion that having a fancy-looking site is pointless. It's competency and reliability that people are interested in. So we focus our attention mainly on that. It's not easy to compete with companies who's net profit is many times ours, and who invest a large part of that into ads and web design.
The only people you can trust are dermatologists and plastic surgeons, basically. Those who offer the treatment in their clinics. There are also many amateurs out there without skin expertise - in that case you better home-roll after reading the instructions :-)