How to avoid repeated data in a select using Laravel?

I have this select

I'm getting all of this information from a table in my database... so I have some repeated rows... I would like to found a kind of if or something to avoid the repeated information in the select... this is my select

<div class="form-group row col-xs-3 col-md-4" >
<label class="control-label col-md-4" >Cartera: </label>
<div class="col-md-8">
 <select name="carteras_id" id="carteras_id" class="form-control">
@foreach ($carteras as $cartera)
  <option value="" class="form-control"></option>
@endforeach
</select>
</div>

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