The phrase "are often impeded" is correct and usable in written English.
It can be used when discussing situations or processes that are frequently obstructed or hindered.
Example: "The progress of the project is often impeded by unforeseen challenges."
Alternatives: "are frequently hindered" or "are commonly obstructed."
Efforts to check illegal trade are often impeded due to lack of proper species identification methods.
City residents wish to have pleasant experience in outdoor space, which are often impeded by thermally uncomfortable conditions, particularly in hot and humid summer.
Many effective methods have been developed, however, they are often impeded by cage protein instability in the presence of reagents or conditions for formation of the nanoparticles.
However, pharmaceutical applications of these products are often impeded because many native producers are difficult to cultivate or show a low productivity.
The coastline of the Black Sea is only mildly indented, except for the northwestern and northern shores, which are low and furrowed by numerous ravines, valleys, and rivers, the mouths of which are often impeded by sandy spits.
However, these efforts are often impeded by stigma against mental illness.
Economically competitive microbial production of biorenewable fuels and chemicals is often impeded by toxicity of the product to the microbe.
However, this objective is often impeded for many lineages of interest by limitations in taxonomic sampling, genomic resources, or functional genetic methods.
However, due to the cysteine-rich nature of these proteins, their expressions in Escherichia coli were often impeded by inclusion body (IB) formation.
The ability to accurately simulate the fate and transport of solutes, however, is often impeded by a lack of information regarding the parameters that define chemical reactions.
The application of new sheet materials is often impeded by the insufficient predictability of the spring-back complicated by the Bauschinger effect.
