Can an alchemist be under the effects of more than one of their own mutagen at once?

[Genesist]

If an alchemist has a mutagen lasting longer than 1 hour can they:
-drink mutagen, let's say they apply the bonus to strength
-spend an hour making a new mutagen
-drink the second mutagen, and have a +4 to str, +4 to dex, -2 to int, -2 to wis, and +2 NA?

[graystone]

Your answer is in the class. "The effects of a mutagen do not stack."

[Mark Seifter]

Mutagen wrote:

The effects of a mutagen do not stack. Whenever an alchemist drinks a mutagen, the effects of any previous mutagen immediately end.

[MrCharisma]

There are DISCOVERIES that will basically give you what you want here though:

GREATER MUTAGEN wrote:

Prerequisite: Alchemist 12

Benefit: The alchemist’s mutagen now grants a +4 natural armor bonus, a +6 alchemical bonus to one physical ability score (Strength, Dexterity, or Constitution), and a +4 alchemical bonus to a second physical ability score. The alchemist takes a –2 penalty on both associated mental ability scores as long as the mutagen persists.

Later on there's also GRAND MUTAGEN and TRUE MUTAGEN.

In answer to your question, the answer is no.

There are rules which allow you to create a second mutagen ...

INFUSE MUTAGEN wrote:

Benefit: When the alchemist creates a mutagen he can infuse it with an extra bit of his own magical power. This inflicts 2 points of Intelligence damage to the alchemist and costs 1,000 gp in rare reagents, but the mutagen created persists on its own and is not rendered inert if the alchemist creates another mutagen. This allows an alchemist to create different types of mutagens and keep them handy for emergencies. This does not allow an alchemist to gain the effects of multiple mutagens—only the most recently imbibed mutagen has any effect.

... but as you can see even here you cannot combine the effects of the two mutagens you've created.