Yes, it is ok to take biotin and collagen together. Collagen supplements and biotin supplements are both safe supplements and in some cases may actually complement each other with their benefits involving your hair and nails. Biotin is typically taken as a pill, whereas collagen comes in many forms.
How Much Collagen to Take for Hair. A general recommendation is for adults to consume between 1 and 3 servings of collagen protein powder daily, or about 10 to 30 grams of collagen per day.
Collagen is considered to be well tolerated with no major side-effects. Minor side-effects include: a feeling of heaviness in your stomach. mild diarrhoea.