While celebrities of all media have already participated in the ALS Ice Bucket Challenge to raise awareness about ALS and ALS research, not everyone is on board and they're making their stance pretty clear.

Former 'Baywatch' star Pamela Anderson, who has been a strong supporter for animal rights, has spoken out against the ALS Association claiming that the organization has done unethical testing on animals as part of their research against the disease.

"I can't bring myself to do your Ice bucket challenge. I enjoy a good dare. It's always good to bring awareness in fun, creative ways. I don't want to take away from that," she wrote in a long post on her Facebook page.

She continues:

Recent experiments funded by the ALS Association, mice had holes drilled into their skulls, were inflicted with crippling illnesses, and were forced to run on an inclined treadmill until they collapsed from exhaustion. Monkeys had chemicals injected into their brains and backs and were later killed and dissected.

What is the result of these experiments (other than a lot of suffering)? In the past decade, only about a dozen experimental ALS treatments have moved on to human trials after being shown to alleviate the disease in animals. All but one of these treatments failed in humans—and the one that “passed” offers only marginal benefits to humans who suffer from ALS. This massive failure rate is typical for animal experiments, because even though animals feel pain and suffer like we do, their bodies often react completely differently to drugs and diseases. According to the FDA, 92 out of every 100 drugs that pass animal trials fail during the human clinical trial phase.

Sophisticated non-animal testing methods—including in vitro methods, advanced computer-modeling techniques, and studies with human volunteers, among others—have given us everything from the best life-saving HIV drugs to cloned human skin for burn victims. Trying to cure human diseases by relying on outdated and ineffective animal experiments isn’t only cruel—it’s a grave disservice to people who desperately need cures.

Please, help scientists make real progress toward treating and curing human diseases by visiting HumaneSeal.org to find and support charities that never harm animals and which pour their time and resources into advanced, promising, human-relevant cures.

Meanwhile, Pink's husband Carey Hart had a harsher tone on his Twitter account.

However, Hart later took to Instagram to explain his previous thoughts.

In a photo showing that he donated to the ALS, Hart writes in the caption: "#ALSicebucketchallenge Alda.org i think people have misunderstood what i was saying earlier. I have nothing against what #ALS is doing to raise money. I think its a very creative idea. Earlier today I was not in the position to do the ice bucket so i opted to donate. When i did that i got a ton of hate tweets about not doing the ice bucket part. And most of the people who were saying things were using the IBC as more of a contest and social piece. Not doing it for charity, awareness, or even promoting ALS. That is why i posted an annoyed comment about the fact that people were more interested in me dumping a bucket of water on my head rather than raising money for a horrible disease. I think it is a great and creative way to raise money but unfortunately, from what i have seen it has evolved into a pass along joke to some."

While some might not agree with the ALS Ice Bucket Challenge, the success of the campaign's results can't be argued with. The ALS Association estimates that over $40 million has been earned as a result of the social attention.