Please recommend an inner beauty collagen product for firming.

Now that I'm in my 30s, my skin elasticity is decreasing day by day.

I hurriedly searched for it and am already using firming care cosmetics.

Then I thought it might be even better to take inner beauty products as well.

I'm thinking about taking collagen right now.

After searching, I noticed that many people consume Collagen Immune Shot, powdered collagen, and liquid collagen.

Please recommend a collagen product among the ones you take that you found helpful for skin elasticity care.